I understand that DBT is a derivative of CBT, but I also understand that the deliveries of each of these types of therapy were very, very different. Core features of DBT such as validation were the difference between it being helpful and me failing it. So I'm not sure what your comment proves. It's a little like saying that Effexor and Wellbutrin are both SNRIs. They are, and yet one may work well for a person while the other gives unbearable side effects.