I think it's the right way to make it open to the audience, because it will definitely take a whole lot time to explain everything. I'm not confused at all, only the many possibilities that could come up as the explanations annoy me.
Also, only my opinion, though, not feel confused might make people feel smart, but I think smarter people can see through that this kind of route leaves a lot of holesthat is better not to think about and accept the twist as it is, if we want to fully enjoy it.
Thank you for replying, I appreciate it

They intentionally avoid all of those questions because they don't know the answers, or want the audience to come up with their own theory. I respect that they went that way because you can't actually answer those questions, and it makes people feel smart to not feel confused about it, and to think about it, and to feel confused by it.
The movie doesn't spoon feed you the answers, It makes you come up with them yourself.