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The cynical answer would be to make money for the producers/studio/investors.
Perhaps to entertain ?
Or maybe to comment on what happens when people aren't willing to change with the times. Butch and Sundance were both living a hedonistic and carefree lifestyle outside of the law and as their sheriff friend warned them, they needed to accept the fact that the times have changed and if they didn't change with it, then their outcome would be bloody and violent deaths. Instead of accepting this and giving up their lawless lifestyle, they decide to move to Bolivia thinking that they'd be able to continue their chosen lifestyle. As we see in the end, it eventually catches up to them. Etta foresaw this and it's why she leaves in end.

The point was to glorify two handsome criminals, which it did very well. It also showed the downside of their lifestyle, i.e. few lasting relationships and living on the run.

Ignorant to a great movie is what I'll call you. And to the OP, what is the point of your existence?
I spend my money on dope, sex and cheap thrills.
The rest of it, I waste.

Addressing the topic question
What is the point of this movie? Certainly not a plot. There isn't a strong narrative here, no real plot. It's just a string of events that happen with these guys. It's style over substance.
I don't know what the point of the movie is. It isn't as funny as the makers try to make it. It isn't particularly dramatic as there is almost no plot.
As a result it's not horribly bad, but it's not very good, either, IMO.
Overrated is what I'd call it.