I agree base-12 would be better (having 12 months is nice) in principle, but in practice I found it rarely to be an issue and I've paid special attention to it

I agree base-12 would be better (having 12 months is nice) in principle, but in practice I found it rarely to be an issue and I've paid special attention to it since I first heard this argument a few years ago because it sounded convincing at first. Stuff like easily using fractions (1.65m, and what's halfway between 6"4' and 6"5'?), division of things with fraction (what's half of 6"4'?), and converting from cm to m is much more common. So while metric does indeed make some things harder, it makes many common things easier. Overall, it seems like a fair trade-off.