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I mean we use US customary and metric too, but US customary measurements aren't always the same as Imperial.

1 US pint = 16 US fluid ounces

1 British pint = 20 British fluid ounces

But wait!

1 British pint = 19.2 US fluid ounces

Would you like to know more? Probably not, but anyways: https://en.m.wikipedia.org/wiki/Comparison_of_the_imperial_and_US_customary_measurement_systems

In real money:

1 US pint = 473ml

1 UK pint = 568ml

Meanwhile the standard metric measure is 500ml. So US would benefit from dropping the pint in favour of metric, while UK drinkers would be understandably reluctant. Unfortunately, most UK bottles are now 500ml, thanks to shrinkflation. Newcastle Brown held out for a while, so did ciders, but these days pint bottles are quite rare.