I do get that there is a fairly intuitive distinction between hallucination (illusory percepts) and delusions (false beliefs). I guess I just worry that when one attempts to characterize the distinction that it might well break down under pressure.

(Similar issues come up with the 'sensation' and 'perception' distinction).

Lets say that one says 'I hear the voice of my dead aunt mavis'.
Is that an indicator of a hallucination: Hearing a voice
Is that an indicator of a delusion: Believing that dead aunt mavis talked to one

My concern is that it might count as two criterion A symptoms...
But that that would surely be counting the same symptom twice...