Fusion supports a wide range of use case from CAD to CAM and others. None of open source tools (FreeCad, OpenSCAD, Opencad etc.) come close to matching Fusion's features. I don't think most even support CAM which I need for CNC tool paths.
I'm currently in an adjacent industry and used a variety of CAD packages in previous work. What you're suggesting is noble, but not really feasible. If you want specifics (and there's a lot of them), let me know and I can shoot you an email.
UX is probably one of the biggest stumbling blocks for two reasons:
Open source software historically treats users as an afterthought (or worse makes really terrible attempts at courting them like GIMP).
Different CAD suites use different terms and have radically different interfaces. There's a lot of (un)learning to do. Go fillet something in Fusion then try to do the same in FreeCAD. Not only is the interface ever so slightly different than Fusion, you have to navigate a minefield of bugs and limitations in FreeCAD. Yikes.
But by comparing Autodesk (presumably Fusion and not e.g. Buzzsaw or Maya) to OpenSCAD you're making an apples-to-oranges comparison. OpenSCAD is a thin wrapper around a CAD programming language, it's an entirely different than something like SolidWorks or Fusion.
You must be inexperienced and/or naive. No firm is going force its engineers to migrate to a different package (open source or otherwise), the cost of relearning everything is simply too high. This was true in the 90s as well.
The case for hobbyists is a bit different as they're often more willing to try something like FreeCAD that's missing a bunch of features or makes them far more tedious to implement. Try dealing with parameters in FreeCAD. Or, better yet, recreate this:
