I don’t know if you intended this as a joke, but this is true and a good UX insight.

For day to day activities, the US customary units are more humane. Foot, pound, cup, are simply common sizes that one encounters. Foot and cup break into convenient units (powers of two in small scale volume, convenient rationals like a half, two thirds, etc for both). A standard stair riser is 2/3 of a foot — 8 inches — for example. The US system is better in this way than the imperial system as the former’s pint, quart etc are more conveniently sized with better fractions.

And, to your point: all this breaks down when the sizes get bigger (or tinier!) than you can physically “handle”. A yard/meter is pretty big (people don’t usually measure areas for rooms etc in yards) and beyond that metric becomes as good and most of the time easier. If only it hadn’t been designed around powers of 10!

But this principle extends to other special case units. For example while I prefer to use metric screws technical reasons, the fractions of 2 in drill threads are much more intuitive.

And you can see this principle breaks down for non-“intuitive” units: temperature is abstract, foot-pounds are not better than newton-meters etc.

But use the right tool for the job. I mostly write Lisp and C++ code but it doesn’t mean I won’t sometimes reach for Python.

Note: I was born in a (then) non-metric country and currently live in the remaining one, but have lived in metric land for a lot of my life and use them both all day long. So no bias.

Except here in the metric land when we want to buy a pound of something (or thereabouts) we ask for half a kilo. And the second can easily be 3/4 liters.