What we see here is what we see for a lot of mental health solutions, it works for some, and doesn’t work for others. Mental health is complicated. As the article points out, if the school environment is hurting student mental health or they are living in an environment at home that does the same, mindfulness isn’t going to change that and isn’t likely to have much of an overall impact even if they engage.
It’s complicated. The solutions are going to be complicated as well. I’d like some simple mindfulness training to be “the answer” for everyone too, but it just isn’t.
On the other hand, if it helps you, keep doing it.