Metric? Keep or change?

[Anthony]

Originally Posted by tbeard1999

Ditch it. The vast majority of your players are unfamiliar with the metric system.

That's almost certainly untrue; we may not be a metric country, but that doesn't mean most people aren't still taught the metric system or have learned it for other reasons (such as other RPGs, including the previous edition, that used metric), and of course international players will be unfamiliar with US customary units.