Smoke filled cockpit, obscured vision from wearing the O2 masks during a fume event or while the other pilot is on a lav break, or more common/likely: taking off 10’s out of FLL into the blinding rising sun and getting the left turn but the guy your flying with grabs the speed knob and whips that to the left instead...

I’m not saying you shouldn’t verify the knob by reading its label, rather there’s an alternative if you are having difficulty and a logic to help build muscle memory.