Mmm...waste of time? Can't find true source? We're taught to assess, evaluate, and diagnose. Set up a prognosis and plan. Then treat. Always reassessing and revising as needed. The trigger point information is so rich and helpful, why just write it off with a swish of the arm? Why can't it work in conjunction with mobilizations and exercises?
After all, if you are stretching a muscle are you not working at bringing it to a non-restricted length? Trigger point release does the same thing for a muscle. So why paint the whole therapeutic method over with such a negative brush stroke?
I think we are taught enough about referral patterns to be able to have some idea of things without feeling we are pellmell bent on destruction-by-trigger-point of say a heart patient.