Ummm... no. Last time I checked Ravelnloft wasn't in the Realms. Nor was Spelljammer. Nor was Theros. Nor as far as I'm aware is Strixhaven. Is the Wyld Beyond the Witchlight in the Realms? I don't think so - it's mostly in the Feywild anyway. The Radiant Citadel is on the Etherial Plane rather than in the Realms. Given how scarce the 5e books have been that's not "nearly every single WotC book".Umm, considering nearly every single WOtC book in the last 10 years has been set in Forgotten Realms, I'd say that a setting where the gods aren't directly active is a selling point now.
If you were paying attention you'd have noticed that Critical Role was popular enough that there is literally a WotC published D&D branded Critical Role setting book plus an official WotC published D&D branded adventure book. Not bad for a third party setting - and a far cry from "not referenced, at all, in any WotC publications". (And no, these aren't third party publications - Critical Role has those too).Critical Role? Who cares? Yeah, it's popular, but, it's still just a side thing. You'll notice how it's not referenced, at all, in any WotC publications right? Since when has Critical Role mattered?
The Forgotten Realms is the default setting for 5e in the same way that the Nentir Vale was for 4e. It's where the default splatbooks are set, has a few adventures set there - and as far as I know only a single official setting book (SCAG).
Have I said that the Cataclysm should be entirely removed? I don't think so. What I've suggested is that the setting would have been improved if the Kingpriest had directly caused the Cataclysm rather than the Gods had thrown it at the Kingpriest.So, fair enough, sell me on a Dragonlance narrative that doesn't have the Cataclym. I answered the question about why the Cataclysm is needed, so, let's see what you think Krynn would look like without it.