Believe me, many of us wish we were on the metric system.
I do a lot of large carpentry projects for fun and wood is produced in inch and foot dimensions—and the most common “beam”, a 2x4, is actually 1.5”x3.5”. You can buy “dimensional lumber” that’s actually 2”x4”, but that’s rare and expensive to find. So putting two 2x4s together doesn’t even make a 4x4 (you end up with 3”x3.5”; a 4x4 is 3.5”x3.5”).
Anyways, as I’m doing calculations I’m measuring things like 5/8” or 9/16” and then adding or subtracting large fractions in my head. It’s absolutely stupid.
Let alone converting between different units makes most people unable to imagine the relative size of things in distance, weight, or volume. I really believe the US education system would benefit if we switched to metric. It almost happened in the 1970s.
Americans will use anything else but the metric system :)