I love both MCU/Netflix MCU and DCCU equally. Netflix MCU. themes are micro and DCCU themes are macro.
BvS was all about "consequences" .

For example, the scene at the airport where Team Stark faces Team Cap, and they start lightly jogging towards each other made me cringe. Not to mention all the talking and humour during the fight (and the in rest of the film).
Now compare that to the stand-off in DC. It's night, it's raining. Batman in his mech suit stares at Superman in the sky. Superman comes crashing down. The fight begins and there's little talking apart from "Bruce, you don't understand""stay down, if i wanted it, you'd be dead already"and then as Bruce drags Superman's body he says "my parents taught me a different lesson, dying in the gutter for no reason at all".
You're comparing the completely wrong fight scene. The final fight, Iron Man vs Cap and Bucky, would be the more appropriate scene. That was completely serious.

I didnt say the scene at night in the rain was the definition of mature. Wow, people on the internet continue to surprise me with their inability to read or to make sense of what they read.
Imagine you're a grown a** man, are you more likely to want to watch a group of heroes playing with each in an airport with lots of humourous dialogue? Or the more brutal fight in BvS?
Case closed. I'm not even gonna read any more replies because you're not smart enough to understand BvS anyway. When IMDB sends me the email that someone has replied, im just going to delete it. Good day to you.

" I know that most kids love Marvel, while adults are generally pulled towards DC"
Now that is just not true. Adults can see that DC movies are not very mature. A scene at night, in the rain? That's your definition of darkness? Get outta here.

What important themes did BvS visit that no other movie did?

But is that DC/Warner Bros. Fault that people weren't on the same wavelength?
BvS was a deeper movie than what people realise, it was the first movie to visit some important themes and I don't think the audience was ready. That's why the majority complained about how serious, dark and depressing it was.
Imagine you were Superman. What questions would you be asking yourself, keeping in mind that you're still early on and relatively inexperienced. Is it right to save one life, at the expense of others? How many lives have I directly or indirectly taken as a result of my actions, or my presence? Was I ever really a hero if I brought pain, suffering and death to others? Is 'Superman' even real or was it just a dream from a Kansas farmer? Maybe the world wasn't destined to react the way Jonathan and Jor-El had thought they would.
And for Bruce Wayne, he's always been one to look after his own, and seeing his building fall with all his employees inside and seeing the devastating effects on their families etc, he wanted revenge. He was also questioning what Batman even meant. 20 years in Gotham, and the weeds (criminals) just grow straight back. Ending Superman might be the only thing he does to make a real lasting difference.
I'll stop here, but I'm actually only just getting started. I could go into more detail with Clark, Bruce and Lex than I ever could with Tony, Steve and Zemo and I've watched Civil War 3 times. People just weren't on the same wavelength as the writers thats all. Ive said this since this BvS release back in March, but anyone who thinks BvS was dull/boring or that the facial experessions were bland etc, simply weren't tuned in to the movie. They weren't putting themselves in the position and instead were judging a movie based on what they would have liked to have seen.

How could you compare that to the Civil War scene or feel more for T'challa? Tchalla and his father had been in the movie for a minute, if that. Then T'challa's father is dead.
"It's not the size that matters, but the motion of the ocean." Just because the characters just appeared doesn't mean they didn't bring something.
It appears to not appeal to an older audience or it wouldn't get torn down as bad as it did. Hell, the darker tone is one of the things that people hated about it. Man of Steel and BvS is them trying to capitalize on the Nolan trilogy and getting the wrong message from it. Same goes for after Deadpool and them wanting to make the rest of the mutant movies rated R now.
And most of those fangirl sites are about how hot they are. Thor, Steve, Tony and especially Bucky and Loki. Natasha and Rey get it because they are women. Prepare for Wonder Woman and Captain Marvel, also. Um, the ending battles of MoS and BvS were the parts people actually liked. It's the lead-in with everyone sporting their best neutral face that turned people off.
"Truth sounds like hate to those who hate truth."

I didn't say I wanted a different type of Spider-Man, I understand is just his nature, but seeing it in the middle of a major fight in a movie was unappealing to me.
In BvS we had more of a backstory from the people in the courtroom. We saw the scrutiny and pressure Superman was already under. The crippled man had and his hatred for Superman. He had been manipulated by Lex Luthor (he was unnaware the bomb was in his wheelchair). The close up of Lex Luthor's empty seat. The disagreement between him and the woman who had stood up to him. The silence, the tension. Then the bomb.
How could you compare that to the Civil War scene or feel more for T'challa? Tchalla and his father had been in the movie for a minute, if that. Then T'challa's father is dead.
Like I said, same theme, i didn't say DC was darker or more mature in theme than Marvel. But they package it differently, in a more serious way which naturally appeals to an older audience.
Of course, adults will go see Marvel movies too. And kids will see DC films. But if you want to see the divide then look on social media. The teenage girls who run thousands upon thousands of Marvel fan pages but you never see them run dc ones. The popular characters are Bucky, Steve, Natasha, Spider-Man and Rey from Star Wars. Its the idea of friendship and banter that appeals to the youth, whereas seeing two serious guys pummel each other and throw each other through walls is less interesting to them.

But that's Spider-man. You want a silent brooding Spider-man? You want to change the character to make it your definition of mature? That's the best Spider-man we've had so far.
Maybe you didn't feel anything because of who the main person to die was. I felt more from T'Chaka and T'Challa than I did from the Senator.
I know that most kids love Marvel, while adults are generally pulled towards DC.
I don't think it's mostly kids that are seeing these Marvel movies. My dad wanted to see BvS. A quarter of the way through he started texting people then had to go somewhere about half way. He never finished the movie and never asked to see it again.
Putting a movie in low lighting and having most of the "good guys" look blank faced doesn't make the movie mature or dark. That's the same trouble that X-men gets into.
"Truth sounds like hate to those who hate truth."

I watched the BvS Ultimate Edition 2 nights ago. I watched Civil War last night. I could barely get through Civil War because of how childish it was in comparison to BvS the night before.
For example, the scene at the airport where Team Stark faces Team Cap, and they start lightly jogging towards each other made me cringe. Not to mention all the talking and humour during the fight (and the in rest of the film).
Now compare that to the stand-off in DC. It's night, it's raining. Batman in his mech suit stares at Superman in the sky. Superman comes crashing down. The fight begins and there's little talking apart from "Bruce, you don't understand""stay down, if i wanted it, you'd be dead already"and then as Bruce drags Superman's body he says "my parents taught me a different lesson, dying in the gutter for no reason at all".
There may be a few more lines of dialogue but nothing like "you have a metal arm, that's awesome!" Which is what Spider-Man says in the middle of the fight in Civil War.
Both Baron Zemo and Lex Luthor blew up a building full of innocent people in BvS and Civil War. In Civil War, I didn't feel much while watching. In BvS, after the woman paused and looked at the "granny's peach tea", I remember the tension and when the bomb went off we saw superman, reduced to tears standing in the middle of the blast. Couple that with Hans Zimmers emotional music and it was a moving scene.
My point is, Marvel may visit some deep and dark themes, true. But it's how they package them that matters. They package it into something that is kid friendly. I run the Instagram page @the.superhero.hub with 26 thousand followers and I know that most kids love Marvel, while adults are generally pulled towards DC. Even if its not more mature in its theme, its more mature in its presentation.

Hope this show shows Luke Cage's dick. Got some side boob but I wanna see what Colter is working with.

Can't agree with you more. Deadpool does have nudity.

Deadpool has nudity

I agree a 100% with both posters ahead of me.

You hit the nail on the head. BvS or Suicide Squad were no more or less mature than any MCU films. At the end of the day, both franchises are about guys in spandex punching people through walls. The DCEU movies just have their characters brood and mope, often for no reason. It's a manufactured darkness that appeals to teen angst: all emotion but no feeling. There is never any levity and that gives a false sense of maturity. The MCU movies seem more comfortable with what they are and they know what they want to be, usually.
The Netflix shows are a different matter. They deal with issues of human trafficking, rape, trauma, etc. just like you said. You still have spandex people punching guys through walls, but there are always deeper things at play. Also, the Netflix shows are not afraid to have levity. There are legitimate funny and lighthearted moments in these shows. This is because the creators know they can give their characters personalities without fear of looking "less mature". There is more realism to them because of this, which is another way in which these shows are more mature.