Re: *Spoilers* Problems caused by the MCU
I think an element of all this is that over the course of many years they have been trying to condition audiences to accept things more like comic book readers do. They're still not quite there but audiences have definitely come a long way in what they'll accept from the leather-clad X-Men of 2000.
You know, it occurs to me that Captain America is basically the superhero equivalent of Mary Poppins. Practically perfect in every way and all that stuff.