User blog comment:Fistful of Force/AP Nid top vs support/@comment-7006769-20130409075434

Thing is she has no way of protecting the carry. All you can do is heal. But if you max the heal then your poke is shit. It is a supports job to babysit the carry and Nid cannot do that. She needs a strong early game carry like Cait who is save and can take care of herself and synergizes with the whole poke idea.

Advantage is obviously the chance that you get a second AP carry (more or less). After you bought Kages and the wardmachine you can ask your jungler to buy aura items which they do in most cases anyway so you can build more AP.