I don’t think so. A few folks really want something thin that can easily fit under the cuff of a dress shirt. And most of us don’t want something so thick that it looks like a metal ingot on our wrists . So with that in mind like 10-12mm is the sweet spot for most people. But yeah some folks worry about it too much, for instance they’ll prefer a manual wind movement to an automatic one since it might allow the case to be a mm or so thinner, and they’ll lament watches than come in both auto and manual and the manual versions aren’t any thinner.