It’s been around for decades as part of the ‘third wave’ of behavioral therapy; it’s nearly on par with standard CBT in effectiveness, though not quite in practice. There’s nothing ground-breaking about it, and no reason to think it will become a ‘big thing’ any more than it already is.
Simplistic to the point of meaninglessness re the goal/values journey. The others re good/bad feelings and anxiety make an implicit assumption that people can easily isolate negative feelings in the moment while detaching themselves and viewing their moment to moment interactions as an outside actor. While this 3rd person analytical perspective is possible for an outside observer, or for a person reviewing their behavior after the fact, it is (in my view) not very useful as a behavioral change paradigm as being in the moment physically and interactionally and outside the moment analytically is an impossible real world state of being unless you are going through life as some sort of constant actor (in the theatrical not the sociological sense).
Very few people short of sociopaths are wired that way.