I think NWN DM Mode could do more, that's true
Such as?
The very important being able to ceate a new NPC or monster on the fly?
Or maybe just as important add a new area to the game on the fly?
And of course the incredible power to create a new item on the fly?
I stongly have to disagree.
The unmodded NwN Client could barely do anything at all except for working with content that was allready present in the module.
Steril maps will never replace the flexibility of tilesets where I can use a certain astetic and style but mold it to needs of my story very quickly. r set up nice gameplay than creating an incredible looking scene, they might be impressed but they don't necessarily want to put 15-20 hours just for one area.
Maps create in NwN are just as sterile as maps created with the DOS2 engine. And if you are happy with the barren empty visuals of NwN, rest asured, with the DoS2 engine you can create maps very quickly in any style and they will still look way better than NwN ever did.
