There has got to be a way for riders to have power normalized. Obviously people may have a powermeter and it is generally accurate. But not all powermeters work a like.
Stages(left side only) - takes power from left leg and doubles it (strain gauge)
Vector(dual sided) - takes newtonian forces from both pedals and adds up
Hub (power tap or kickr) - takes power after losses through chain drive and cranks
Quarq (chain ring style) - power is measured through the chain ring
Even some smart trainers are wheel on and have power at the wheel to roller interface.
Maybe just a few hold power at a particular level, and allow an algorithm to better profile power.