We all know that Proof is its own system and is not entirely integrated with Workfront. However, as part of that continued integration between WF and Proof, different Groups will want to use different decisions for their own workflows. This should be able to be set on the Group level, just like any Project/Task/Issue status.
Considering Workfront now has a Group-centered approach to being an enterprise tool, this is a no-brainer to help with easier adoption.