The problems of Dwilight are the problems of most other BM continents: geographically, too large or too long. EC's basically a strip of diagonal land. Perdan and Sirion, on opposite ends of that stick, have showcased their inherent advantage (I mean, they've been around every since way way way way back). Or take Atamara and (somewhat modified) Beluaterra. Realm capitals can take literal days to reach a border/battle area, especially if your neighbors are your friends and your enemies are all the way in Irombro while you're in Firbalt or something.
War Island I think is a very good example of a nicely laid out geography. Compact, each capital somewhat equidistant from each other. Refit and recruit times are fairly short. The way Dwilight was shrunk, it left just the western eastern half that ended up combining the too-linear and too-large problems of EC and Atamara/Beluaterra.
