There are also tons of machines and tools made to work in inches. As more things are becoming computer controlled, it’s easier to convert between inch and mm on the fly, but every drill bit, end mill, and tool holder for the manual mill in my company’s shop is in inch.

I’m also gonna disagree with you on the 12 better than 10 front. Just use a calculator if you can’t do it in your head and round to the nearest mm. I bet you’ll learn what 10/6 and 10/3 are faster than 12/5 too.

I’ll go see a few of IMAX movies per year, but why bother going to a regular theater anymore.