You forgot one: Fasteners, i.e. nuts and bolts, when all the rest of the world has been metric for decades and whatever it is you’re taking apart almost certainly uses metric bolts (car, appliance, electronic device, whatever). But your local hardware store still gives you attitude over metric being ‘’‘’‘’‘‘specialty’’‘’‘’‘’ and the majority of their selection of bolts and machine screws are fractional inch which will not fit approximately 99.8% of all manufactured goods from the last century, let alone this one.