Strange comment. Strange because at the high end, I very much doubt that any non-human ape will ever get close to Adam Ondra's ascent of "Silence" (9c). On the other hand, the average human is very much less able to climb trees and other topologically similar objects than most apes. So I am not sure that it really makes sense to talk about "our lack of climbing ability" - in humans, it is unevenly exercised and thus shows huge range, but the best humans can climb in ways that I doubt most or any other apes could.