I wouldn't even say that it confirms a problem with the design, just that it probably wouldn't be a bad idea to have the thing labeled in the first place. If h

I wouldn't even say that it confirms a problem with the design, just that it probably wouldn't be a bad idea to have the thing labeled in the first place. If his sole reason for disliking this particular interface was that he couldn't remember which switch was which, I too am quite surprised that his first thought was to have a new countertop switch installed rather than stick a label on it or grab a sharpie.