my understanding of endgame time travel is that if someone went back in time (ie. steve going back to 1940s) and they did something different than what had originally happened (ie. steve saving bucky from being tortured by hydra nazis), it won’t affect the future (ie. endgame!bucky wont grow old or be any different) but instead create a new diverged timeline (ie. steve and past!bucky growing old together in their intended timeline happily)
also known as me trying to make sense of endgame ending
like sorry but steve going back in time and not saving buck knowing what he know is just out of question and if u dont think so u know nothing
TLDR; MY GRANDPA BOYFRIENDS DESERVE A SOFT FUCKING EPILOGUE AND IF I HAVE TO GIVE IT TO THEM MYSELF THEN SO BE IT