Nova has followed this process of marking the config options deprecated for one release cycle and then deleting them in the second release cycle, for many releases now.
If there are things we can do to make the list of deprecated options be more obvious/visible to end users/downstream apps in future releases, that's great to discuss, but I don't see any reason why we should stop following our existing process for removal of deprecated options.
Nova has followed this process of marking the config options deprecated for one release cycle and then deleting them in the second release cycle, for many releases now.
If there are things we can do to make the list of deprecated options be more obvious/visible to end users/downstream apps in future releases, that's great to discuss, but I don't see any reason why we should stop following our existing process for removal of deprecated options.