I'm not exactly sure what ur gettin at, but it sounds kinda like "I can climb better on my SS" and "fs bikes are hard to climb with"
I think the true advantage of gears is for when you are tired, a ss would be alot tougher for those 12hr+ races. And you can't go as fast down hills
My FS def sucks up some power climbin, but i think it makes up for it by keepin the rear wheel on the ground, I've also noticed I stand and smash differently then i did on a hardtail or on my roadbike, hard to describe it just kinda happens, but its kina like quicker bursts of energy instead of truely honking on the pedals, so i can still sprint up the hill but with less pedal bob than if i wear to truely crank it, I guess its just smashing in a slightly easier gear