Originally Posted by
Ptrvc
There's character development and then there's having Superman kill criminals or the Punisher not kill criminals. It's just against the core of the character.
Hulk being a loner is like that it's not something he's supposed to grow out of. It's part of his core identity.
Secondly, I'd presume that any major growth for the character would come out of his solo, not out of team book. Team books tend to focus on the folks who don't have a solo on the team.
Lastly, about the power thing. Teams work when members all have unique roles and a purpose to be on the team. The problem is when the power between characters is wildly divergent, to the point that one member is better at everything than the rest of the team.
You either get the problem of Aquaman on the Superfriends where, since Superman can do everything he can do but better Aquaman becomes the talk to fish joke.
Or you get the modern wording problem where the supposed powerhouse only exists to get their ass kicked bu the villain of the week. Hulk in every MCU movie post the original Avengers.