Agreed for most people with mild-moderate mental illness. It's an intervention that can reduce intensity for quite a number of people, though not everyone. (I wish more people would also get checked early on for easily fixed metabolic stuff like low iron, wonky thyroid etc.)

My completely anecdotal example... it kept me from starting crazy meds for at least an extra year or two (by the time I was up to 1-2 hours, 7d/week, it was time to bite the bullet.. though at lower doses than I likely would have otherwise needed.