When buying goods some things are measured in metres some in centimetres and many in millimetres, so we have to go armed with measurements in all of these including imperial measurement to make sure we don't get caught out.
So, if someone wants new curtains, they need to take 4 sets of measurements to the store with them?

Oh, that would
never work over here.

Most of them won't bring one set of measurements!! They just keep their receipt and return it - then no one else wants to buy it, because the package is opened!!

Sadly, common sense is becoming fairly rare.
For as long as i can remember the US has talked about changing to the metric system but they've never gotten around to it. They talked about how expensive it would be to retool all the manufacturing sector. I can envision what a mess that could be.
Anyone who works on cars has to have two sets of tools. Which in turn leads to being more convenient to have two toolboxes, which leads to the garage being quite cluttered.
And then you have the sleep deprived bakers who for some perverse reason chose 13 for their bakers' dozen.
Baked goods used to be sold not by the each, but by weight. (The price to be determined by the price of wheat. They had to stay current on prices, even after buying their wheat.) If a baker was caught selling short weight, they would be punished. Which might mean a fine, or it could mean being flogged or pilloried. So, in order to stay on the right side of the law - the Baker's Dozen. (And one for good measure.

.)