Nobody wants to spend the money to convert entire industries

There are multiple industries who prove this isn't a blanket rule.

There's a reason you buy soft drinks in 2 L bottles and not by quarts or whatever unit you use for that kind of size. Because of alcohol sizes, people also intuitively know 500 mL (which I believe has pretty much replaced 16 floz~us~ bottles) as well as 700 mL bottles for wine, etc.

There are a bunch of other examples where metric is seeping in.

I feel very sorry for US based engineers though, since many industries don't really have the same push to convert, RIP.

I also LOVE seeing that many American social media creators have started using "grams of protein" (they still say per "serve", instead of per 100g, which is silly, but in time they might notice that grams per 100g is a percentage and see how much more useful that is for comparison purposes).

There's even this guy who weighs food to see which is more "justified" for the price. Eventually his viewers will know how much things weigh.

We'll get ya, in time. In time you will be assimilated, resistance is futile ;)