Our drawing conventions based on the Australian version of the metric system never refer to .375m for example. That is always just 375. If a drawing calls for 24.466m it is written as 24466. For any drawing for a residential building or smaller structure down to cabinet work, everything is in millimetres. There is no 'mm' after every measurement on the drawing, just the raw number. There will be a reference on the information panel as to what the units are.
Machining drawings will be in millimetres to 3 decimal places. Civil works drawings will show decimals to 3 places. Then the main units will be metres but roadworks can be kilometres as well when the job is large enough.
The common thread is that every unit step or part thereof is a multiple of 1000 from microns right through to kilometres. It works the same for weight and volume as well. Cheers
Every construction obeys the laws of physics. Whether we like or understand the result is of no interest to the universe.