Most people could potentially do better long term with therapy rather than psychiatric drugs. Studies have shown that’s the case even with relatively more severe mental illness like schizophrenia.

Leaving aside whether this holds true in society at large, since I honestly don't know, it's still a dead argument in the US. Many people simply don't have access to a therapist to pursue therapy as a viable treatment plan. Even if you have insurance that covers it, it can be out of reach for many financially. When I was doing it on the insurance plan at my last job, it was brutal for the first 4 months of the year paying out of pocket for it until I hit my deductible, and I was making decent money at the time. There were also constraints entirely imposed by the insurance system, rather than medical need, like no more than one session a week being covered, and eventually hitting a number of sessions that my insurer deemed the most I could possibly need in a calendar year. The crazy part was, that was the best insurance I've ever had in my life.

If this was legitimately more like a mental health retreat that focused primarily on the therapy aspect, I could see it potentially being helpful for people experiencing a short-term mental health crisis, but for those with chronic mental health issues, it's an entirely unviable approach without first reforming the state of health care in the country and ensuring that individuals would have reliable access to mental health services upon completing the program that didn't require them to either be wealthy, or choose between paying for care and being able to afford to keep the lights on or buying sufficient food, or any other necessity of life. Absent this, you'd just be developing a revolving door of a system, where people come in, get therapy and start to improve, are thrust back out into the world where they cannot continue therapy and relapsing, winding up back on RFK's labor farm.