Please correct me if my assessment is incorrect.
Best Case: Users that want to be both less identifiable and post in limited exposure topics won’t need to wait for someone to let them into the topic.
Worse Case: More work connecting accounts when necessary.
Current Case: Users can post either anonymously in public topics or in restricted Categories as themselves, but not both until someone adds the anon account to the Group.
That sounds like a fair amount or work would need to be done compared to how many sites would use it.