My issue is they don't address mental health in a responsible way.
Ah. I kind of think of that as the point. Because, honestly, our reality doesn't address mental health in a responsible way, either.
Remember that superhero comics books don't generally lead the times by very much, and movies even less so. They are modern mythology, and express the times in which they are written. They are stories about now, not about where the future could be. These are times in which we are recognizing that we don't do well with mental health - so our comics give us examples, writ large because that's the style of superhero comics.
Tony Stark gets his issues largely managed off camera, during the five years of The Blip, by actually getting himself a personal support structure. Hulk, similarly, gets himself under control in that period. Note that, once this happens, their stories are pretty much done.
Wanda's story isn't done yet. So, yeah, she's still in the woods.