While i've enjoy avengers endgame there were a few plot points I wish the movie had stuck with from the source material comic./
now there alot they got right about thanos and there quite a bit imho they got wrong and iwsh they would have again stuck with the source material
^ Thanos worship /Obsession with death.
Looks, Thanos core is a obsession with Death. He once told someone that his mother tried to stab him as a baby and he said i wish she succeeded. i'm not sure the reason why this plot device wasn't used in the comics but I believe it could have easily been adapted and quite well especially considering what happens in the climax of endgame.
Thanos self confidence issues.
if you remember from the comics thanes at the end of infinity gauntlet Thanos failed to use the gems and felt he was unworthy. that he subconsciously wanted to fail.To me this was his ultimate weakness. it's a interesting weakness when well written especially given his arrogance that he's more than capable to back* up.
lack of cosmic entities.
Ok i get mCu is on a budget but how do you not include some of the cosmic entities/ Warlock, living tribunal, eternity? I mean you got the guardians of the galaxy involved.Defiantly a missed opportunity
Gems not being sentient.-
that's it for now. I'll try to post more thoughts later.
EDIT: some interesting ideas of what ifs.