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This is sadly far from the truth. Manufacturing is nowhere near metric conversion. Horsepower, foot-pounds, and my all time least favorite unit, the mil, are everywhere. And relatedly, manufacturing execution systems that use localtime internally cause all manner of hilarity twice a year. It’s like we’re just deliberately trying to be bad at measuring things.

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Force and mass is what always drove me crazy in engineering school. I assume that courses in the US have largely given up trying to pay some lip service to common older units but sorting out pounds-mass, pounds-force, and slugs? Pretty sure I couldn't do it today.

The rocket company I worked at designed their orbital rocket in inches and lbm. Engine flow rates in lbm/s, temperatures in deg Rankine, thrust in lbf. Btu/hour/inch^2/degR heat transfer coefficients.

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