Over in the Superman movie discussion,
@TheSameIdiot called Superman an "altruism fantasy" and it's such a great descriptor that applies to a lot of what I look for in hero movies these days. Maybe when I was younger, it was exciting to see someone be a dick and win, but middle aged me really wants to see people get ahead by doing the right thing. There isn't nearly enough of that in the world right now. I think that's why MCU Cap, who defies writing norms by having an unchanging personal code and lack of real growth, holds his value to me in movies long after Tony Stark learned the power of sacrifice two or three times.
Also, like
@fac said, I've been plugging along in my Infinity Saga rewatch in another Lounge thread (thanks for the plug!) and seeing them all in a clump really highlights when trends take hold and how the occasional wrong lesson was taken from another movie's success. I promise you, Thor: Ragnarok, Guardians of the Galaxy was not a surprise success because they told jokes.