This is SUCH a big bee in my bonnet. It is simply bonkers that we still use anything non-metric, whether it's yards, feet, inches, Ounces, pounds, stones, hundredweight whatever. My late father in law was a chippy, and he used to talk in something like three sixteenths of an inch etc. Yes I know that MPG and Miles and various others are in common use, but that doesn't make them right or even logical. We'd get used to change in the same way as we got used to monetary decimalisation.
Of course, the main reason much of this hangs on is because the Americans use them, Ah not quite, many of their measurements are actually different to ours although they have the same name ! Even more nuts.
I have an american made Guitar. I needed an allen key for the bridge saddle, I didn't have one. It turns out that the correct size is 0.050 (Metric) of an Inch (imperial). The same but cheaper model of guitar made in Far East have metric. Arrgggg I found a company that imports the keys. In medical devices metric parts of an imperial measurement is quite common.
I will now retire while the dinosaurs tear me apart