Dreams, I believe, play a major role in reorganizing our deep thinking.
But by that token, one would think that some figure who might have a different dream than OTL does so because their circumstances are different somehow. Then it's the different circumstances that are the real POD.
On a historical timescale, different dreaming is a subset of different thinking.
So by that same token, we could easily see abuse of the "dreams can be PODs" idea. It would be the same kind of abuse I've seen in some timelines, where the whole reason and justification of all the frequent divergences is, some historical figure the author thinks was put upon tragically with bad results for the world as a whole, is suddenly a super-smart and far-sighted Mary Sue who just has different ideas and reactions than their real-life counterpart did, for no reason other than it would have been better in the long run if they had.
So we don't need dreams as PODs to enable that sort of bad writing, since it is apparently an option without that concept!

But I'd guess that a lot of people, bewildered by the novelty of the device (here) or hoping to bewilder others, might take to smuggling in ridiculous flashes of insight and foresight, repeatedly, in the form of dreams.
When dealing with a modern person from our era that doesn't assume that dreams are from some external spirit world, it's well enough to take note of the vividness of an insight that might come from a dream, but stepping back a bit we just say "so and so had this idea;" we don't distinguish whether they had it by day or by night. They considered their circumstances and came up with a response--maybe it wasn't the waking mind that worked it out, but it was certainly the waking mind that executed the new plan, so...
What if we are dealing with people of a different mindset, who do believe dreams are sent by the gods or some such? Can we get away with "the gods" sending them some very good advice? Nope! Presumably if Athena or Thor was sending some Greek or Norsewoman some message in OTL, presumably if these same gods said something different in an ATL, it was because they too had solid reasons. And presumably if Loki or Vulcan was not telling any ironsmiths of their era how to make steam engines, they'd maintain the same sort of discreet silence in an alternate timeline, unless it happened to be "steam engine time" in their Alt-world for the same broad reasons it was in ours.
In short--dreams may be a vivid and poetic way of
describing a POD. To suggest they
are the POD is at best to subscribe to the view that actually there really are other intelligences than human at work here--a defensible and interesting notion to be sure--but more likely, will be tried out as a cover for really dumb timelines. That last is a shame and I'm certainly not suggesting that we must shun dream 'PODs', just recognize them for what they are.