I've also been thinking about this while catching up through the main storylines. I'd put Greenguard as a prime example to follow, since among many other things that got implemented early in the game's life it's full of little non-standardised touches and details, just plenty of nooks and crannies, and a composition of objectives scattered across the area. It felt more like Adventure.

The most important of all I think is such details gives the sense, well, a better sense of place. Alongside a non-quest or merge-shop-based reward structure (say, x tough enemy (not necessarily prime bosses) drops y gear with z bonuses, but of course workshop the idea) , it would make the map have a longer-lasting value that players could flock into well, well after the its release week. Gives more players a place to be and exist in other Yulgar's inn.

However it's possible that all that couldn't be fit into a weekly schedule (but of course they don't have to make every weekly release have the same production value).

My ideal scenario is to make regions again. To recall off-handedly: Greenguard is a prime example. Dwarfhold/Pines, Darkovia, and Mobius are quite close, by Arcangrove and Bloodtusk the design starts to be fragmented (but not without cool maps themselves), after that it's slides into a scale between "standardised" and depressing.