Its true though. A shoe that has a wide enough toe box and enough padding to allow good time on a grueling descent is not going to be that precise, sensitive or aggressive (if that's what you need). I would not dream of doing any of the scree-field descents that I've done, certainly not in the face of a coming storm, even in my Enduros. It would be shear suffering, and it'd slow me down.

Climbing and walking require different things from shoes and trying to compromise between the two means that both will suffer, in my opinion, more than is allowable.

Not to get into some kind of pissing match, but what were these long Yosemite descents like? I've never been to the Valley, so I don't know. What I do know is that if the descent is more than a mile or so, I'm bringing approach shoes. Blisters that prevent me from climbing the next day just aren't worth it.