I do understand this because I used to think it but it's actually a misunderstanding (or use?) of the FMS.
I should have been more clear that I do not mean to conflate the FMS and my statement about "specialists". The two are not connected, and I personally love the FMS. Most "specialists" have some kind of cockamamie certificate. I myself have a "spinal injury management" certificate, an "upper body post-rehabilitation" certificate a "lower body post-rehabilitation" certificate and an "advanced strength training" certificate; they're not worth the paper they're printed on, but I need continuing education credits to renew my training certificate and they look good to prospective employers.
Kelly Starrett's approach is mostly soft tissue work with lacrosse balls and joint distraction.