It's more than just visual pleasure; it's immersion. More precisely, accuracy of description of game world, as well as (in my opinion) game logic. Or that it never felt right to, among other things, not have them in battle yet losing them anyway if the base falls.
The original game couldn't do this, because of how little MCDs it could handle at once. Now we can have this, so why not?
Yes, lack of nodes can be a problem. But still, it's now possible (again) to add many more nodes than in the classic game, so it's an easily fixable problem.
Is it a high priority request? No, but I still think it'd be pretty awesome to have. (As well as your Engineers and Scientists running around the base like civilians. Heh heh.