In my opinion, it would be beyond confusing, and needlessly so, to have both named and unnamed-but-numbered tropical systems, with both conventions being used simultaneously. Imagine a category 5 hurricane, strongest ever on record, not being named simply because it's in the middle of the ocean and not impacting land. Do you want something like that unnamed? Or would distant tropical storms only be numbered, but an unnamed tropical storm would get a name if it becomes a hurricane, even if it's still in the middle of nowhere?
Too much confusion.