Tav, I'm a bit confused.
Changing the Inkscape Document unit should not introduce any transforms on elements nor should changing the SVG root width/height or the viewBox.
So what should happen to
<svg width="100mm" height="100mm" viewBox="0 0 100 100">
when the "Inkscape Document unit" is changed to inches? Is it going to become
<svg width="100in" height="100in" viewBox="0 0 100 100">
and hence 1 mm becomes 1 in? If so a 3,937% scaling must be applied to the whole document to get a unit change while preserving the original physical dimensions. Are you saying that one should (or may want to) apply this scaling manually after changing the document unit?
For sure if the "Inkscape Document unit" has been changed something must happen somewhere.
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