To coin money, regulate the value thereof, and of foreign coin, and fix the standard of weights and measures;

They simply refuse to do anything about it.

The military converted to metrics some time ago. I suppose wouldn’t mind if we used the English system for day to day uses but the metric system exclusively where it mattered, like engineering. Maybe then we could avoid disasters like what happened at NASA when they lost a satellite because two departments were speaking to each other in different units but didn’t realize it.

OTOH, even when we think we’re speaking in the same units, often we’re not. British recipes typically look that their American counterparts, but British kitchen units of measurement are actually different than American ones. IN other words, an ounce isn’t an ounce:

http://www.recipegoldmine.com/kitchart/kitchart35.html

Happy cooking!