It's pretty standard for docs working for WC in particular and insurance companies in general to say whatever they need to, to deny patients treatment, meds and benefits.

In the case of primary care and specialists some are corrupt and are on the take (there was a massive case in Los Angeles a few years back and the doctors were only caught because they were so lazy they used the same report for hundreds of patients seeking SSI benefits for children), but some of them are just overwhelmed and believe their patients are deserving of SSI/SSDI and are trying to help them out by saying whatever they think is necessary. My impression is that SS likes as much physical evidence as possible because they just don't trust doctors the way they used to. That's why I stress that Functional Capacity Testing is a good backup to have with a RFC form.