For me (and this use case) exporting arcs and circles is a must. I don’t care if they’re represented at segments in SketchUp, I just need clean arcs when you export.
If you make a SketchUp model with good arcs and circles (IE you just use native tools and don’t scale them) and then export a 3D cad model you’ll see what I’m on about. They come out perfect when you do it that way, not when you do a 2D export though.
Is something like that hard to implement?