I guess a right setting for a TTRPG needs options for stories without links to the main metaplot. For example Ravnica is a plane with multiple factions, and this is good to be used in D&D but Theros and Stryxhaven are relatively boring for "spin-off" adventures.
Maybe after the future event of "Reality facture" Ravnica could be "retouched" to add a style closer to Sigil(Planescape) and the Radiant Citadel.
Other point is maybe there are plans for Duskmourn, and this plane could suffer some serious change. The good new is we would see outdoor zones. The bad new is theses would be more like a zombie post-apocalipse survival videogame. The trick is the urban zones aren't true outdoors but more like a city within a dome. Maybe a spaceship with some interplanar-travel engine was atacked by an enemy alien and then the malfuction caused a "planar-landcrashing" within Duskmourn. The worst part is for the survivors in the criogenic capsules. Now they are living a true endless nightmare within a timeloop
A new and fool suggestion is using the plane of Cappena like a Duskmourn spin-off. How? Around the megacity of new Capena the rest of the plane is pure postapocaliptic. Then let's imagine an exiled Lovecraftian cult who summons an entity to rebuild the civilitation. The idea works.. more or less. A terror-eater fiend like Valgavoth is summoned but there is some changes. This being has got a limited-ared reality-wrapper powers, but only around certain supertowers or arcologies (this has to be built by others according certain rituals and it needs a lot of time and material) and it only can feed on fear by people who suffered danger-addiction or were willing to face risks. The trick is to build dungeons with fabulous treasures. Then there are enough adventurers. The main leaders of New-Capena allow this because this terror-eater is a fabulous "firewalls" against new invasions by Phyrexians and other planar intruders.