In reply to aln: It's all about the tolerances for the movements and positions. The amount of power / strength you have may widen those tolerances a little or even a lot. For example if you are out of balance a little because you're feet are wrong if you can just bone down on crimp super hard and lock it down it'll compensate and you'll make the move. Where as someone far weaker couldn't do that, they would have to get their balance and weight distribution much closer to the perfect mark in order to pull off the move.
On hard routes the tolerances are very fine, and often the amount of power you have won't be enough to make much difference or the with slabs the angle makes pulling power almost redundant altogether as they may be no meaning full holds or in fact by the nature of it you may be pushing and palming your way up.
So in short there is no upper limit really on how technical a move can be. It may be possible but require a very exact set of movements to stay on the rock with almost no room for error and being on the very limits of what the friction and your shoes will support.