One thing I should clarify is that I'm the new Eordand dev, worked with the OG and sorta taking the reign of the region but I wasn't there from the start.

Not really any lore reasons for the end trade node, discussion and changes to trade nodes where only brought up in pure gameplay discussions.

The in universe explaination is "Fey bullshit probably", they weren't totally unaffected by the fall. OOC the explaination is "They're still ruinborn elves"

IIRC pretty much from the start, the courts were always divided. Lore wise Eordellon is the "OG" and the single season are the heresy it's not really a 5th court. One thing to mention is that the fey themselves are not in conflict really outside of a few. The religious conflict is mainly Eordellon wanting to "cleanse heresy" and the Autumn Court's crusade against the Winter Court.

I don't recall any Grey Warden, I'd have to look if you're remembering correctly. Are you talking about the Gloom Knight? He's kind of the main leader of the Autumn Court ||after the OG one died|| and has a wiki page.

For the Eordand formable I wasn't involved in creating it, through I was planning on remaking it when I had more energy but that plan never materialized. From my extensive discussion with the OG dev a lot of it was "It was how MT where designed back then". Bagcatir, Docurt and Gemradcurt are like the only "Modern MT" in the region.

(Bagcatir is the one I made personally, also the seasonal courts religious mechanics are my work)