when people trip on a curb, or stub their toe, then they can wind up doing dances every which way...
"stumble on partial PSR success" would emphasize the importance of piloting, as a complimentary skill, to gunnery
w/o good pilots, 'Mechs would wind up stumbling around the battlefield, emphasizing the importance, of the pilots, and their difficulty in piloting advanced BMs, even w/ neurohelmets