I use metric for all my design work as that’s what I grew up with, but in the US, “Standard” or “Imperial” is much more common in traditional engineering circles.
A “Thou” is a thousandths of an inch - 0.001" - but when they say “tenths” they mean one-tench of a thousandth, or 0.0001, not a tenth of an inch.
Metric is much simpler. 
This but in bigger letters
Metric is much simpler
There was a few years in the 80s where there was a concentrated push to at least teach both so that a US kid would have the ability to work with people all over the world…but of course it died. I have imperial memorized because I use it, but metric is so much simpler!!
Try growing up and completing high-school in a strictly metric country, then moving to an imperial (UK) for college, and having engineering-related studies.
As I love to repeat (not original) - there are two types of countries. Metric-users, and the one that put people onto the moon…
Tbf, when the world learned that the moon was not in fact made of cheese….
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