I mean:
why? 
There is one method to change control points location of a SubD?
One, at least one! Be it grasshopper or c#.
I need it. For RH7. Since RH7 release.
Jumping to mesh and back to SubD mess up a lot of things, like turning Ngons to triangles.
(And yes, we need better control also for ngons, for meshes and subds…)
I’ve made many scripts to work with SubD, but it really feels a “abstract/forgotten” type, compared to other geometry types… seeing the situation from a user. I’m sure under the hood it’s wonderful, but we users can only use rhino commands or GH+rhinocommon.