Book of Boba Fett included half a season of The Mandalorian because Disney didn't know what to do with Boba. And we were stuck with it being on Tatooine AGAIN.

Giving him a redemption arc was just stupid.

Avengers Endgame was the peak of the MCU. All the A list superheroes literally saving the universe. Disney should have taken a break for a while to save the brand.

However they didn't. To totally understand the future MCU movies, you had to watch several shows on Disney+ for it all to make sense. And these are not the familiar A list superheroes that a non Marvel super fan would know.

Therefore Phase 4 and beyond are diminishing returns and you will see more disappointing movies and poorly performing box office going forward.