Even in France, inventors of the metric system in the 18th C., you can still buy vegetables in livres [pounds], firewood in cords and threaded plumbing items clearly labelled in BSP/ANP. My bar has pint glasses. The BTU is still used to measure heat worlwide. As it happens my size 11 boot measures [and holds] exactly 1 foot & my hand is 4" wide. We still measure by the mile and the knot in the UK. Windspeeds are still quoted in Beaufort Scale, [based on mph]. As to the old gram-second-centigade units- they are deader than corduroy: SI units in metric were adopted well over 30 years ago. But imperial measure persists. Why? Because for the man in the street the metric system is a half-baked idea cooked up by intellectuals. Not, you will note a 50% idea, but a good ol' fraction!
Wood work but can't!