McR theory are correct in almost all conditions, could be that on the ridge with dynamic lift should other theories be used.

But with that said di I also have to say:
The master of McR theory will never outperform the master of finding good climbs and the master of finding the best route.
I spend very little time and energy in decisions on STF, I try to spend most of my time and energy to find the best route and to get the best climbs. And most important of all, avoid the bad climbs.