Pins are really no different than the resolution of the lines on a dial or any other gage. I have used "tenths sets" as variable data very readily - if the process variation or tolerance (whichever was applicable) was wide enough. Some people think it is not "continuous" data, but, again, it as continuous as the dashes on your dial gage! One of the best ways to measure MMC including fit.
As far as explaining to a customer, never assume they are more expert than you. Be prepared to train them, if need be.