I'm A Banana
Potassium-Rich
But what kind of Feywild is it?
Sometimes, like in a setting where nature is twisted and magic is horrifying and you must scrape desperately to survive, the simple fact that there is a place of nature and magic that you can run away to, is enough to rip a hole in the setting's atmosphere (a different atmosphere being one of the big things that a setting gives me as a consumer).
The question isn't "what kind of feywild is it?"
The question is: "Do we need the Feywild?"
Not every setting needs a feywild, or an astral sea, or any of these "cosmological constants." Not every setting needs dragonborn and tieflings. Settings can be different. That's half of their appeal.
so long as the things it adds to the setting are cool and interesting.
That's just it: it doesn't add much to the setting to have Eladrin or the Feywild there. The setting had magical deserts without 'em. The setting worked fine with their absence. And by their inclusion, the idea that you can bamf to the magic desert next door does (IMO) wound the setting in a pretty big way. And they're not even very cool and interesting (largely the same, but now with psionics instead of magic).
If all it did was add something cool and interesting to the setting, I probably wouldn't have a problem with it.
But it takes away much, without adding much.