Couple of comments/questions.
First, how is this different from Proxy Affinity feature of 9.5? Not from the perspective of implementation (how you see this feature in UI), but from the use case perspective. Because from the UI perspective, of course I will exhaust all my options before adding the totally new concept of "Zones" for our users to deal with. We don't want to become another CommVault in terms of complexity
@DeadEyedJacks ability to group proxies is something we do plan to add, in fact this was originally planned for 9.5 - but eventually I've decided to instead use the same dev resources to build Proxy Affinity functionality instead. Not that the latter completely replaces the need for proxy groups, but it certainly allowed us to address much more scenarios than proxy groups alone would.