The UK sorta tried switching to metric but didn't do it completely and now has a weird system where the system you use depends on the situation I hate it
what's right with it? doesn't make sense it exists at all. it's not 10- based obviously, but it's not even 12- based like other imperial units. it's 14 pounds! 14? who came up with this shit?
Obviously it's stupid compared to metric but it's no worse than the rest of imperial, it's not all 12 based. There's 16 or 20 oz in a pint depending on UK or US. 8 pints in a gallon. 3 yards in a foot. It's all stupid.
I didn't compare it to metric though. and yes all your examples are stupid. I just said stone is my favorite because it feels so out of place for me.
you got the foot-yard backwards but at least 3 is a factor of 12. also inch, foot and yard, while impractical in ratios, are somewhat helpful lengths. like you can easily visualize an inch or foot, probably better than a mm or cm.
the pint/gallon was probably backward standardized, in that they were probably measures used for various drinks or cargo and named for those and got roughly standardized with 8x or 3x feeling appropriate. but stone just... exists it feels like. for no practical reason.
I end up doing a lot of lazy maths, and remembering rough numbers.
45MPG? That's about 10 miles per litre.
8 inches? Eh, 20cm.
Anything remotely technical, I convert everything to metric (and actually take the time do accurately).
Having the inch-fractions to mm table on the back of a ruler is very useful when using old drill bits and spanners.
The US does it too, the other way around. They use fractions for a lot of things (3/8", half a foot, etc.) and then switch in decimals (like "2.5 inches") when they think you're not looking. Except for bullets for some reason which are in mm.