Having watched a few streamers play this one, I think squeenix intended for Kamala Khan to be the "every man" entry point for the player. You follow her story as a regular nobody who gains super powers and joins an elite team of superheroes, and you learn about everyone else and the marvel world in general through her fresh eyes.

Except these are the most famous characters in the entire fucking world now, so we don't need some nobody as surrogate for the audience. Everyone knows the main characters in this game - they're the reason people want the damn game in the first place. Forcing players to spend a significant chunk of play time as some rando they don't know in order to "slowly introduce us" to characters we've known for a decade is just dumb.