PSIs suck harder than a $5 *****. There's no question there. From the training department perspective, it's not as a nefarious plan as you might think. They're wanting a core group of instructors who will be around long term. Line pilots flow. PSIs stay until they croak.
They want to go back to a time, before we were flowing, when we had long term instructors in the training center who lived there. It's a great theory..except PSIs aren't in the same leage as our old lifer instructors. But what evs...life is too short. There's lots of wet kitties to play with out there, gentleman.