Just to understand this better (it seems like a useful proposal) this example observation would show up in Identify for both mites and wasps, correct? The main downside I could see would be the following sort of situation:
Observer uploads a bunch of photos with Bsal in the filename, which are then automatically identified as chytrid fungus. An identifier adds a new ID as a plant. Under the current system, that is enough to hide the observation from those identifying chytrid funguses, but under this new proposal it would take the effort of several identifiers before that happens. So, a possible downside of the proposal is that it would become harder to remove clutter from Identify, requiring attention from multiple identifiers, not just one.
This is not necessarily a dealbreaker, but worth thinking through the possible negative effects on identifiers.