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you can have differences of usage even within metric. english speaking countries seem to dislike centimeters, for example. they’ll say 150mm instead of 15cm, from what i’ve observed. they’ll avoid decagrams too.
It’s usually to do with precision.
150mm means 150mm, but 15cm means between 145mm and 155mm.
There would be a similarly strange, but slightly different graph in Australia. Weight is always metric, unless your a boomer in which case it’s stone.
Yeah my Australian boomer dad likes to use inches and feet intermingled with metric measurements.
Most commonly it’s when things are 1 inch or 1 foot, but he does use multiples at different times.

