I'm surprised there isn't actual CAD software for VR yet. When I tried tiltbrush for the first time I was immediately struck by how easy it was to create some

I'm surprised there isn't actual CAD software for VR yet. When I tried tiltbrush for the first time I was immediately struck by how easy it was to create some things, but how much of a pain it was to modify things, or make things like parallel lines or surfaces. Maybe everyone is waiting for someone else to do it. Even the linked software (gravity sketch) seems to be missing constraints, dimensions, and snaps, though it has control points so modification of existing geometry is at least possible. What gives?