God, I long for the day we get a decent open source CAD program but we just arent there yet. Script-based cad like OPENSCAD is just awful, especially for anything complex and extra-especially for assemblies, and while freecad has improved massively it's still a very similar UX to Sketchup circa 2009 :(
CAD/CAM is one of the biggest underrepresented areas for opensource software, unfortunately largely because it's so damn hard. There's a reason basically every open-source polymodeling system pulls from Blender, and that's because it's the only robust opensource option out there that's usable (though blender UI/UX is notoriously terrible for good reason, even after 2.8 and 3.2).
And unfortunately blender isn't CAD software. Fun for noodly 3D printed parts and technically you can design functional components in it... but it's deeply miserable to do.
IDK I'm just screaming into the void. grrgh.