MCU is actually a bad example here. Because generally directors are tied to a single property there (like say Black Panther or Thor), which isn't on a breakneck timeline. MCU all exists in the same universe, but its not really a franchise in the same manner. Additionally MCU just kinda does stuff different than anyone else since its less of a director-focused/owned project.

For your suggestion, a thing like Star Wars 7-9 is more a valid thing as these are all sorta happening at the same time so they need to divide the work to get it on time.