Hulk standalone I know they wanted to have a nice character arc for him from Ragnarok through IW and Endgame. He does have that arc, and had a hugely important role in being the one to do the snap that brought back those dusted. But it still seems like they left his story unresolved since we never really find out why he was scared to come out after getting whipped by Thanos. Yes, that beatdown was enough to have him shook - but if that was the only reason I'd want to see him resolve it by beating Thanos down himself.