Monitor match is always usable, I'm just saying that it is a bit misleading. It scales the sensitivity using the angle ratio, the angle used being a specific percentage of the horizontal angle. The amount you rotate per count obeys this, it works as intended. I'm just highlighting the fact that the monitor distance match rule, the main marketing point for this method (remember that people pay actual money for this conversion), is not always true. It's always true using a script to send counts vertically, but horizontally is only true when the pitch is somewhat neutral. Anywhere else on the screen and it's not really going to be a match. The main thing to take away from this is it may show that we don't perceive sensitivity using a distance on the screen.