I was talking about the factory floor. Even if we switched to metric tomorrow, you would still need wrenches to work on things made before the switch. But cutt

I was talking about the factory floor. Even if we switched to metric tomorrow, you would still need wrenches to work on things made before the switch. But cutting tools are consumable. You need new drills, taps, dies, and cutters all the time. Manufacturers have to stock twice as many because of metric and imperial. Those are big ticket expenses.