I know people with these problems and therapy did not help them. In fact, I think they became worse and the T fed into their perfectionism by telling them
how great they thought they were. Even tried to teach their perfectionist client manipulative tactics to use with people to get them to conform to their "perfectionists" ways. The T took a shine to their ocd client, could not see beyond their nose, and actually assisted them in believing they were "perfect" (when no one is). Some really SICK people that I know.

Maybe the T has the same problem as their client? Must be why they got along so well.