"Myths are public dreams; dreams are private myths.
By finding your own dream and following it through, it will lead you to the myth-world in which you live. But just as in dream, the subject and object, though they seem to be separate, are really the same."
Joseph Campbell - summarizing CG Jung.
I used to think a lot about this - in the era from c1998-2008 when I was most into New Age, neo-paganism, neo-shamanism, Jung, Campbell and synchronicity...
My current opinion is that it is sometimes true - myths are sometimes public dreams, dreams are sometimes private myths (although not very often, in either case).
But - so what?
Unless either myths or dreams or both are more than just myths or dreams - so what if they are the same in essence?
(This 'essence being, presumably, the level of the collective unconscious (i.e. a universally shared psychological sub-stratum.)
So what if humans share a deep psychology - unless this signifies more than that humans share a deep psychology, it merely kicks the can of meaning and purpose a little further down the road.
Maybe this knowledge is potentially therapeutic, but therapy for what? Psychological well-being is a means to an end, not an end in itself.
Thus the Jungian perspective is actually a fake religion: it does not deliver - and this failure is not (fundamentally) because it does not work in practice (which is probably true); but because Jungian/ New Age perspectives intrinsically lack the resources to supply that which needs to be supplied by a religion: meaning and purpose.