Chaosmancer
Legend
Quasi-elemental planes tend to be extra intense, but can still be plenty interesting. Radiance already has a powerful healing location, and you can do so many cool things with light, color, reflection, etc. Ash has a lot of different forms and some interesting interactions with heat and cold. Salt can have so many different forms with giant crystals and salt storms and liquid salt that slows light. Dust has sand and rust monsters/dragons and empires and all kinds of fascinating decay situations. Etc. etc. Also remember that you can have chunks of other things in the elemental planes.
A mountain can be a big dumb rock or it can be Olympus.
Sure, but conservation of story. What can you do with the Quasi-Elemental plane of Dust that can't be done with a lower plane like the Grey Wastes of Hades? I can easily (and have easily) thrown an empire of decay and dust into the Shadowfell, which is a land of decay, dust and rot anyways. Salt can be interesting, but do I need an entire plane of salt or do I just need an area of salt the size of a small country somewhere else?
This extends, for me, into the elemental planes as well. The Elemental Plane of Water is just... the ocean. The only difference is that I can make things bigger, but since most oceans on most settings aren't planned out, and I can have "the ocean but bigger" in the Fey wild and "the ocean but scarier" in the Shadowfell... do I need the Plane of Water really? The only thing I really use it for is for the Marid genies, but that's it.
So, if I barely need the Plane of Water, do I need the Quasi-PAra-Elemental plane of Salt and Ice known as the Stinging Storm? It is a cool weather effect (salt hail) but that seems to get so specific as to be really hard to use.