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There's no law in the U.S. that you must use imperial units, and I'm not aware of any serious professional that does.

It's also such a silly argument coming from the brits who swap their units almost randomly: https://ibb.co/0cB4tgd

Every carpenter I’ve met uses sixteenths of an inch, and every metal worker uses thousandths.

Neither of those jobs require serious tolerances

Sounds to me like what you meant to say is that your criteria for determining whether someone's profession is "serious" is whether they use metric or not.

Sounds to me like you're not commenting in good faith. Begone, nerd.

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