Parmandur
Book-Friend, he/him
So, in addition to the Adventure book covering one Donain of Delifht, and introducing Domains of Delight as parallels to Donains of Dread ruled by Archfey instead of Dreadlords, we got this:I would say Radiant Citadel was, as it presents a brand new setting hub with about a dozen sub-settings. Witchlight, on the other hand, is just an adventure in the Feywild, with no real setting-type info.

Domains of Delight (5e) - Wizards of the Coast | D&D 5th Edition | Dungeon Masters Guild
Domains of Delight (5e) - All proceeds from Domains of Delight go to non-profit Extra Life, an online grassroots movement working to save sick an
Which still feels an awful lot like a Feywild version of Chaoter 2 of Van Richten's Guide. I can easily imagine a product similar to Can Richten's detailing a number of Domains of Delight, with Fey player options and Monsters along with Fey Adventure advice.