The Infinity Saga came to a close with Phase Three, as every hero in the shared universe took up arms against Josh Brolin’s villainous Thanos.
The Russo Brothers methodically crafted their two pair of Avengers movies, which were shot back to back.
But Endgame and Infinity War contained plenty of concepts that ended up on the cutting room floor, including a very late entrance for Captain America in the latter project.
The Marvel Cinematic Universe is currently in a unique place, we it’s occupying in the limbo between phases.