Oh, yeah "does it matter?" I run games in which weapon ranges are given in metres, and games in which they are given in feet, and one game in which they are given in yards, and one game in which they are given in squares (each square being ten feet), and sometimes a game in which they are given in hexes (each hex being two metres).
Having the distance and token-size tools report in feet is not convenient. Having them report "five feet" where the scale is actually one yard, one metre, two metres, or ten feet is an obscenely-qualified pain in the arse. If we get confused over whether "30 feet" is six yards or ten yards, or over whether it is six metres, nine metres, or twelve metres that will not be satisfactory.
But if the scale and measuring tool say "distance: 11" I am perfectly happy interpreting that as 110 feet if I'm playing "James Bond 007" or 55 feet is (God forbid!) I should be playing D&D.