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No, the all measurements in the StarOffice -> OpenOffice Draw/Impress legacy
are derived from raster screen bitmap graphics which has maintained the text
"print" centric practice and uses a smallest "Field_Unit" of twips for
calculations of placement onto the canvas.

A twip  (1/1440") --from Postscript 1/72" point-- is a screen independent
value converted (and rounded)  in calculating vertex placements as pixel
dimensions.  There are routines to convert measurement from twip to mm or
inch--but they are equally imprecise for use in CAD.

Meaning there is no history for vector based measurements (vertex, angles,
radius, and distances) needed for CAD. What is provided is all geared to
rendering bitmap onto a raster canvas--for  resample to screen pixels.

So, the "arbitrary" lack of precision is a function of the resampling to
"fit" bitmap elements to pixels of a raster screen. wo Floating point
precision of measurements remains much less significant than performance for
rendering the twip derived document canvas. Yes there was a tradeoff, but an
easy one to make.

If you need the precision for CAD you want a program designed to handle
vectors under the hood, not bitmaps--period!

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