if you really do formatting on a regular basis then you should first wonder about your os, about the legality of the business your doing, or about your general computer knowledge. no offence bud, j/k
in general it is a good idea to print such details like m894746348 out. even if one is not formatting on a regular basis.
but to get to the point: sure it would be easier for users to use email@example.com (which is unique as well)
instead of m987987349,
and i dont know why this is not so,
but heck, is it really such a biggie?
but i do understand you to a level