But noblegiraffe, wouldn't that depend on whether we had any evidence that it had worked with a different selection, for a different problem, in a different setting? After all, you probably wouldn't improve the general wellbeing of a random bunch of teenagers by feeding them painkillers but for the ones who were in pain it might actually make a difference.
For my dd, who was a) experiencing a genuine and clearly defined problem b) anxious to work hard at any technique she was taught, mindfulness was a very useful part of treatment and actually did a lot of good. Otoh nothing that required patient participation did any good with her brother who was also struggling but suspicious and refusing to engage. And it would have been a complete waste of time for me at that age because I wasn't struggling and had other things I wanted to get on with.