how many times does a concert pianist rehearse a piece, focusing on certain movements, and even portions of a piece before actually performing it?
Or football players, baseball players, basketball players, soccer players, etc. Rehearsal in climbing is called practice in other sports. And rearding martial arts, consider trying to break your first board in front of the sensei without ever trying it outside the dojo first.
logic doesn't apply here...
You must remember that they hiked uphill both directions in driving blizzard snows while suffering unbelievably from the scorching 120 degree blazing sun and carrying lead bricks to anchor to so they could ascend their 5.8c/d moss covered, slug infested death defying ankle shattering heroic endeavor of a route. Each time they lowered desperately from the second move (and then the third, then the fourth, and so on...) of the route so as to stay pure to their ideals. This was due to the fact that they didn't want to suffer the "boos" from the massive audiences that also hiked uphill both directions in driving blizzard snows while suffering unbelievably from the scorching 120 degree blazing sun...