Warner Bros butchered (30+ minutes) Batman v Superman to make room for more theaters. The Ultimate Edition is cut in a manner that conveys the main characters' motivations.
I'm sure they could've cut 30 mins of story from Endgame if Disney really wanted to try making more $$$$$.
Warner Bros also butchered (about half of) Justice League and removed their director, to try making it 'more like Marvel', just because they thought it would make them more money. Factually, it gave their executives end-year bonuses, instead of delaying the movie to make it more polished and watchable.
Basicallyyyyyyyy... Warner Bros doesn't give their employees any creative freedom. Rumor has it that the Nolan Bros are the only reason that Man of Steel didn't get tampered with.