If you're asking for games to arbitrarily use enough extra horsepower to meet a targeted framerate then you're asking for the older games to be patched. Patches require work from the developers, and for hundreds of older titles that just isn't feasible.
My argument was that if Sony knew, as they did, that they would be supporting a mid-gen hardware refresh, then they should have mandated arbitrary resolution/framerate support from the start to account for new hardware. Developers would still have been able to set an upper framerate cap, but this would have allowed newer hardware to eke out additional performance without any need to go back and patch in support, just like any PC title with a capped framerate. Instead, we now have a library of titles that will only ever operate at their original clock rates on the PS4P and beyond.