/snip
Krynn has a track record of various cataclysms screwing everything up, forcing people to spend a long and hard time gradually rebuilding everything. So the low-magic nature tends to be in cycles, with the more 'iconic' eras hewing closer to the lower end of the supernatural spectrum.
I think I could agree with that. Obviously, there's no clerical magic between the Cataclysm and the War of the Lance. But, that being said, I'd say that War of the Lance era gaming was pretty typical for a lot of Dragonlance, and wizard magic was hardly rare. And, let's not forget, by the War of the Lance, you have vast armies of magically created draconians being led by hundreds of evil dragons. Oh, multiple flying castles and armies being led by death knights as well.
I suppose it depends on how you define "low magic". When you have magically created enemies and dragons in every single adventure in the DL series, plus a boatload of magic items, including a LOT of artifacts, it doesn't really feel low magic to me. And, when comparing settings, one has to be careful about not being anachronistic about it. Greyhawk, while it did have Barrier Peaks, generally hewed pretty low magic in the modules with (mostly) humanoid enemies and not a lot of casters. And, sure, we can talk about Forgotten Realms now as being really high magic, but, at the time, it really wasn't. There was no Halruaa, for example, back then.
When I said that DL was the gonzo setting, I was meaning of the time. Flying castles? Yup, that was first in Dragonlance. Mystara would be another ten years before it saw the light of day, although the Known World was a thing (but, nowhere near the gonzo stuff that Mystara would be famous for). Sure, as I said, Greyhawk had Barrier Peaks, but, other than that? Not really much else. All the Castle Greyhawk stuff wouldn't come until quite a bit later. The Greyhawk boxed set came out in 1983. The DL modules hit the shelves in 84 through 86. At the time, DL really was the gonzo setting.