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The 'false precision' argument only works if you ignore how Significant Figures work. Nobody writes 9 decimetres after all, they put 90cm.  90cm no more confers false precision than 900mm.

Long numbers are not in any way more awkward than decimal points. Australia again gives a good example in construction: all dimensions are in millimetres. No cm, no metres, all mm. You have a 12m long wall, it's 12 000mm. Want to get an exact bit between two studs avoiding a pipe attached to the side of one? 11 952mm. 11.952m is awkward, as is 119.52cm.

There are plenty of daily use cases where you need measurement precision finer than available with a cm, so inevitable you end up having to put a decimal point in there.

Rather than continuing to rant, I'll defer to existing ranting.