Yeah overworking actors less is good, plus it can give others time to shine.
I think the problem is that the movie decided to have more of a horror theme going on, and horror movies don't really need character development, which can even explain why Wanda's motivation and characterization is so basic, and she's not the only one too.
Problem is, if it were a random movie with random characters, that wouldn't really be a problem, but having already established characters, it makes the bland characterization look much worse.
And having to wait for a third movie for the possibility of him getting developed, and I'm not even sure if there's a third movie planned within the next 5 years, man... Sucks for him.
If he's lucky he might show up in a random series and do stuff though.
Or maybe in someone else's movie, I mean Wanda stole his movie from him, maybe he can steal someone else's
.