It's simply a forced perspective. Frankly, calling it archaic is a little bit of a low blow, considering forced perspective is popular, at any time, in most mediums. The reason this game will use a forced, fixed perspective, is for a couple of reasons: first, if you want to play the same game with a 3D camera, Neverwinter Nights is always available, Dragon Age also. The big issue with those games, is that the camera gets in the way more often than not, so you find yourself always managing it. A lot of 3DS games on the other hand, still use the flat backgrounds, which seem to have aged just fine, and are intrusive to gameplay.
Frankly, I'm glad they are NOT spending much of the 4 million dollars on 3D camera, and focusing on art, game design, and content.