If you pick apart DSM5 it has lots of problems, and probably always will. Criteria for diagnosis change, when people don't. This round of DSM5 may qualify you for X diagnosis, and DSM 6 may not, or you may have something else. I see it as society and people change, DSM changes it's criteria, and the insurance companies go along with it cause it's all they got. Diagnosis dictates what meds you can have and they'll pay for, how many sessions, and how often. I guess this is the insurance company's only way of being accountable.
What's real-therapists do what they have to do in therapy-insurance companies can't dictate day to day therapy since it is so individual.