That was pre Captain America: Civil War. In Civil War, Cap told Ironman that Bucky killed his parents, telling the only secrete he ever kept, therefore making Cap worth to weild Thor's hammer. At least that is one theory i read.

I thought Endgame was fantastic. It has a little bit of everything, funny parts, sad parts, closure for main characters, ties into the old movies well and so much more. Looking back on the original Ironman from 11 years ago, the story line is dam impressive.