Strange Planet by Nathan W. Pyle

I mean, it really depends on your line of work. I work in physics and I often just say 1e-9 m instead of converting to nm. Or I'll say 1e-4 in instead of .1 mil (a mil is one thousandth of an inch). So I just don't care what unit system I work in when I do science related work, as long as the units are explicitly stated so that you don't compare inches to mm on accident.

I have multiple relatives in construction though and they seem to like being able to just divide boards into thirds without dealing with decimals.

In the end though, now that everyone has calculators in their pockets, it's all arbitrary. It's so trivial to convert between different units and unit systems.