Community Manager Grimiku responded to a thread concerning Scaling damage in Greater Rifts, and revealed plans to disable permanent crowd control in an upcoming content patch. This will of course be tested in the PTR for analysis before going live, so further adjustments might happen by then.
We’re looking to disable permanent Crowd Control in an upcoming content patch to create more interaction with monsters at higher Greater Rifts levels. To complement that change, we will be also be evaluating how much damage monsters are dealing to players in that environment. One of our goals in the next major patch is to provide a more consistent Greater Rift experience while making sure that defensive Legendary items still matter.