Agreed. I'm currently in a regressed state but a few times I've successfully done this and it changes life. Extremely locked down screen time rules are necessary - break the exciting loop of picking up your phone, eventually you'll re-associate the phone when each time you pick it up you're met with disappointment that nothing exciting is allowed.

Life just slows down in a way that allows you to appreciate little things, make better decisions and treat people with more empathy, read more, reflect on life, get better sleep. ADHD is easier to manage. Less decision fatigue and general mental fatigue (I personally feel that scrolling/youtube are not mentally refreshing and leave me just as if not more drained after).

The danger is in letting yourself slip. It's a very quick slope and brain chemicals are usually stronger than our willpower. Even knowing how much better life is during these periods, I'm still currently in a down cycle because I'm struggling to find the energy to make the right choices. Work can also be draining which takes away good choice energy later in the evening.