What's the point with that quite lackluster story in Endwalker?

[CrownySuccubus]

I doubt we're going to visit every reflection, especially since they'd need to come up with reasons as to why we'd be limited to small areas of them. It worked for the First because 9/10 of it had been consumed by the Flood, all that was left was Norvrandt. We still have at least 2-3 continents on the Source we haven't explored too.

That last sentence is why I can't see them needing any more reason than "The world is, like, really big, man."

The Source alone got away with being the sole setting from Expansions 1.0 - 4.0, being limited specifically to Eorzea for the first three of those, and even as of 6.0, we still haven't explored all of it.

The other reflections could provide content for dozens of future expansion. They have no reason to rush.