can't say what the deep idea in this case is per se (haha (maybe the other commenter can shed light on that part)), but i guess if you have enough KPIs to be able to rotate them you have yourself a perpetual motion machine of the same nature as the one that some genius carried down from the mountain on stone tablets that we can sustain maximum velocity ad infinitum by splitting our work into two week chunks and calling them "sprints"... why haven't marathoners thought of this? (h/t Rich Hickey, the source of that amazing joke that i butcher here)
maybe consciousness itself is nothing more than the brain managing to optimize all of its KPIs at the same time.
A 90 day target is questionable, but regularly changing the metrics are a good way to keep people from gaming them.