My dad was a commercial electrician in the IBEW for thirty years. He went to college and got a bachelor’s degree and now works in a shop that does drafting for buildings. Inside wiring stuff.
I probably could work for them. I’ve done it before. Mostly moving machines around.
Anyway he’s very traditional and conservative, and he reckons in pretty much any units. Metric, Imperial, and a lot of more “scientific” ones, like joules, kelvin, moles with his pocket almanac.