We hear you but I think you will enjoy more your work and how you use Rhino if you treat SubD and Rendering in Rhino as ‘barely better than having nothing at all’, and have no expectations of those tools to be any good. Especially if you are used to the tools/capabilities/feel/performance of Blender.
I gave up on Rhino SubD modeling a long time ago; it’s only limitedly useful for a quick edit of a few points/edges here and there, from SubD models modeled elsewhere. Even that limiting editing does need to have things like sliding working flawlessly and it’s not even close.
This, 3 years ago, I think was my last assessment of SubD in Rhino after fighting with a model and spending 2+ hours doing something that should have taken me minutes: Friction in SubD continues, all so unresolved, so slow, so frustrating
Today, I wanted to do a very small/quick thing: I couldn’t because we still cannot even use bridge with a mismatched number of edges on each side:
This is why all I want is a live link Blender <> Rhino where I can use both tools for what each is best. Maybe in another 3 years we see something in this direction?
G