Is it easier or harder to consistently make therapy appointments if you have a safe, consistent place to sleep and to keep your belongings?
Is it easier or harder to attend substance abuse counselling or programs if you have a safe, consistent place to sleep and to keep your belongings?
Is it easier or harder to regularly take your psychiatric medications if you have a safe, consistent place to sleep and to keep your belongings?
Is it easier or harder to avoid traumatic events if you have a safe, consistent place to sleep and to keep your belongings?
Sure sounds like it does something for mental health to me. Would your mental health be as good if you were living on the street? Mine sure wouldn't.