Species complexes are by definition (1, 2) situations where it’s generally impossible to identify organisms to species with photographs, or even with specimens due to taxonomic ambiguity. As a result, nearly every complex level observation could reasonably be marked in the DQA that the community ID cannot be improved.
Despite this, it’s fairly common for organisms in one of these complexes to be identified to species. I think this is a mix of observers not knowing about the existence of the complex, desire for species-level identification, and desire for Research Grade status. The results can be seen for example with the Narceus americanus complex where there is no known method for separating the two species (if they’re even separate species) yet there are hundreds of observations RG at species level, and the issue is just too large and persistent for identifiers to keep up with (the other fix would be regularly merging the two species back into the complex to automatically fix the observations, which has already been done once…).
Other than completely redoing the Research Grade system, I think the best solution would be to change the automatically-Research-Grade-level from species to species complex. It would save identifiers time and energy and more accurately reflect the nuanced taxonomy of these situations, perhaps even educating observers. In special situations where the organism is identifiable to species, it could still be improved, just like RG species can be identified to subspecies.
Originally suggested here: https://forum.inaturalist.org/t/troubleshooting-species-complexes/13252/20