I don't understand why would be so wrong allowing the user to choose the default units.
Neither do I. That's why, in my original response, I wrote, in agreement with you,
"However, Inkscape is, as you pointed out, extremely useful (and used for) graphic design. So it would be nice to have an option to change the "master unit" for a file, so that it is reflected everywhere."
The only contrary point I made was,
"since Inkscape is an SVG editor, it makes sense that its default unit is pixels, since SVG is a web standard, and web designers use pixel sizes primarily in their designs"
in response to your contention that
"Vector graphics are used to create elements that can be scaled without having to worry about the pixel size, so using pixels as default units doesn't make sense (imho)."
If you read carefully, I agreed with everything else, and supported what you said about being able to change units easily and having text sizes in points.
I'm really not trying to be argumentative, just got rankled when my explanation and supportive comment were taken incorrectly. I'm sorry about that.
JF