Mike - What’s going on with him?

Update: It seems like my question came off as harsh and I need to clarify: I love Mike. He’s probably my favorite character which is why I’m a little frustrated they keep adding new characters and developing them instead of Mike

The Duffer brothers are very talented at developing characters….. except wth are they doing with Mike??

His lack of character development is extremely noticeable and he has no story arc. Which is surprising bc he was the first character we all connected with, and they keep saying he’s the “heart” and the “leader”…..

Do we think it’s bc they have something huge planned for him in S5??