I had some applications in mind. First, blending buildings. I’d find it useful to have a 2D program with dimensions so I could size rooms, doors, windows, trim and so on properly. Second, scaling furniture. To get tables to match sofas and chairs and lamps, I’m currently using the old eyeball. The ability to draw, say, a chair to actual dimensions would be great. Third, working out corrections on not-quite-side view photos. I have a method in mind that would project landmarks shot at some angle onto an ovoid, then developing true z-axis dimensions from intersections, like reversing the process of drawing a perspective from planar views.
Basically, Blender doesn’t do dimensions. I don’t have a problem with that. Blender isn’t a drafting program. But, just as I use the Gimp to do paintings to use in Blender, for the occaisions when I need a painted image, it would be nice to have a drafting program available, for the occaisions when I need a precisely dimensioned image. Just an addition to the old production pipeline.