Thanks Fredo.
Do you think it possible to technically achieve this? In particular, I'm interested in a workflow where all hard edges are rounded for a given object at once. Even better if it can be proxied, so one could continue working in the non-rounded version, then update the proxy.
Blender has a great set of plugins called hard ops, which does this. This plugin is amazing, and I think this can be done even better in SU if there's a good enough fillet algorithm.
https://youtu.be/MOr0RBraRaI