Fully agreed on that.
The only proviso is that I think it's less that exercise makes depression better, and more than a lack of exercise makes it worse. It's a subtle distinction, but makes a difference.
Unfortunately, it seems that self driven treatment is the norm. Even worse, if you stop engaging with it (due to being unable to balance everything), it's taken as you are now fine, and you are removed from care, and so back to square 1.