The full blown 3D CAD programs _do_ have easily definable dimensions and a constraint solver for drawing sketches. The problem is that in these softwares, it’s typically assumed those sketches are going to be used to make a 3D part. So you’ll extrude the sketch along a line or sweep the sketch around an axis or something to create a 3D part. Consequently, what you can do artistically with the sketch ends there.*

I’m not looking for that 3D aspect of the software. Once I have the sketch dimensioned and constrained, I want to start doing artistic stuff with it like changing the line style or color, adding a gradient fill, adding text inside it—-stuff you’d use Inkscape and the like to do. But Inkscape doesn’t have the constraint solver or easy to use dimensioning tool.

*To be fair, you could probably export the line after fully defining it in CAD and import it into Inkscape, but that’s not much fun.