I don't think I can perceive a half-pound difference, but half increments are still nicer than needing the whole range of decimals. If I have to say 0.7 anythin

I don't think I can perceive a half-pound difference, but half increments are still nicer than needing the whole range of decimals. If I have to say 0.7 anything in everyday life, then it's not a good unit. Speaking of which, there's nothing stopping us from using something like SI prefixes with customary units, for example kilofeet. We just don't need to.