Great find! Now, I hope the Rhino devs finally know how to fix AI export.
Manually having to apply ConvertToBeziers is a pain, especially as it doesn’t preserve layer information. At least for the given drawing, I already have a script that prepares production. It removes duplicate lines, adds connection bridges, etc. So I can add ConvertToBeziers somewhere.
Thanks. The exported SVG could be imported into Inkscape just fine, great!
Now, for the quirks:
When importing into Xara Designer Pro X11, I see garbage:
That could of course be a Xara issue, and also Xara is not the destination platform anyhow. So, that’s not important.
The curves in the text get approximated by straight lines, which does not look nice.
I had some trouble, so I tried this way for some black and white icons created in Rhino… which is fast for creating good vectors… I rendered the icons huge (Overkill) 12000x600 pixels…saved as a bitmap, Opened in Inkscape and right clicked the image, and hit the trace bitmap type thingy… default worked great… move the top layer that has been created off and delete the under layer… results are awesome… The nicest bit is that I don’t have to do any layer wrangling because I made surfaces in one shot in Rhino, made them black before rendering the bitmap… This is a better solution than fighting the Ai export for what I was doing. Thanks everyone and the dude who made the “Tracing bitmaps in inkscape” youtube video 
