I don’t think is fatigue is just the right stories need to be told with the right characters! Deadpool and Wolverine( a rated R film) did 1.3 plus billion ! Last year! There is no fatigue. Guardians 3, in 2023, did 840 plus million! Again those numbers are there and will be there if the stories and characters are told correctly…I just haven’t seen movies do this and studios need to come to grips that superhero fatigue is a thing. These films are essentially sequels. They are continuing stories from previous titles. 600 million is a lot but if they had that budget I guess that’s what they thought.