Agree although surprisingly the About section is a little vague on some of what OP wanted.
OP, it's an SVG editor so should be perfect for real world projects you allude to. You can set the canvas size and change the default units with relative ease; Pixels, points, millimetres and inches but also Parsecs if you want to go wild, and as it's SVG it'll scale as needed without issue. https://logosbynick.com/change-the-canvas-size-in-inkscape/
There are also measurement tools too and areas can be calculated (but objects do need to be converted to paths to measure areas).
Everything else is covered in the about.