Y'all remember when Steve said "I've been too content with letting you live in the shadows, or on the edge of nowhere because well maybe didn't want to know the answers [...] we're at our strongest when we're together. That's why, from now on, we stick close". Remember when he said that? To Bucky?
Yeah maybe not.
Cuz it was in the comics and the Russos are too afraid of how powerful we'd be if Steve said anything remotely close to that in the MCU