I been thinking about Radical and Acceptance long before DBT came out. 

Individually as concepts and both words used together in a Christian context.  

Perhaps some things need to be accepted, but "need" concept is pretty tricky here.

It can be a big problem if it is applied inflexibly to the wrong person at the wrong time.

I am concerned by young or inexperienced MH workers mindlessly applying concepts to vulnerable people without sufficient attention to context.   Ahem ... even if they are proficient in mindfulness techniques per se ...

I can see DBT is a broad program. 

Life and Lived Experience is a rich resource too.