This whole conversation isn’t even just about the cast from Avengers: Endgame being larger than that of Avengers: Infinity War, though.
Ignoring the consequences of The Decimation for a moment, it’s noteworthy that Chris Pratt’s Star-Lord not only never makes it to his home planet of Earth, but also never gets to hang out with the likes of Captain America, Black Panther, Hulk, and Black Widow.
Similarly, we still haven’t seen what Doctor Strange can do teamed up with Avengers other than Iron Man and Spider-Man – and those guys also still haven’t had the chance to meet Rocket or Groot.
As alluded to, it was tremendously exciting to see members of the Avengers and Guardians of the Galaxy interact for the first time, but it should be recognized that there are still a lot of key characters who haven’t met each other yet.