I think DBT can be very useful for a lot of people, I have never gone to a class just for DBT, I live in a tiny town , I cant drive 50 miles away X times a week, So My T and I blend many many things into my Therapy plan.
The DBT process is learning ways to change how you react to stress or triggers. Redirect your thoughts.
Anyone can learn how to say " I'm not going to automatically react with anger or self loathing ( for instance) But it's actually being able to USE the skills when the shyt hits the fan right then right away.
That is when you can see if you are learning the skills and applying them on a daily basis.
I remember growing up and having to learn addition and vocabulary words.. I practiced over and over and over until I didn't have to " think" about how 2+2 =4 ..it just did..
DBT isn't for everyone, I have learned on my journey to pick and choose what helps and dismiss what doesnt.