I’m curious if you think this is a real deterrent for identifiers seeking to use subspecies IDs. In taxa that I ID, some people use subspecies and some people don’t, and from what I can tell, it has nothing to do with how the system handles it, and is mostly related to convictions about whether location alone should be used to ID to subspecies.
This is not true for most splits. The only time this is true is when no portion of the range can be unambiguously assigned (via atlases) to the output species.
(Note: further discussions about when and why people should use subspecies IDs are probably best had in another thread, e.g. this one or this one.)