Inconsistency between map borders
Though it seems minor, one thing that bothers me with Dragonwilds is the big inconsistency between how map borders are defined across zones.
After Brynmoor and Ghornfell, every other zone is circled with an impassable barrier - usually a big wall or something - that makes little sense to it's surrounding geography. While that's quite understandable in Fellhollow, Dowdun Reach and Umbral Sands should have no physical (or at least visible) wall separating them from the rest of the world. It looks ugly on the map (and inconsistent with the first two zones) and keeps players from the wonder of seeing a zone from a distance.
Think of it like this: after you reach Fellhollow, from that point onwards, you'll never see the ocean jn the new zones anymore. It's simply gone. You'll always be surrounded by barriers wherever you go, like you're forever in a valley or corridor. It's contained in such a way that makes it feel less like a open world and more like small levels.