You may be interested in CAD Sketcher: https://www.cadsketcher.com/

You're on point that there's a tremendous amount of money captures by Autodesk for CAD software that could be better directed at the open source community instead.

Software like OpenSCAD and FreeCAD are obviously not suitable for much commercial work, and have very irritating limitations for hobbyist work, in my mind a big part of that is the UI and Blender has a good and established UI at this point so I'd love to see the open source CAD that provides an alternative to vendor lock in come from a Blender add-on instead of a separate program.

I am no expert but as I understand it the primary difficulty with developing good alternatives to commercial CAD software lie in the development of an effective geometric kernel.

It seems to me that if a developer of an opensource CAD program develops it as a Blender add-on they can effectively outsource the remainder of the development efforts to the Blender community while focus can be made on the CAD kernel itself.