So.... AP jungles still really are super niche and/or tanks

seriously what's up with this. I mean i understand most AP champions are very slow at clearing and very mana restricted without blue buff, but isn't that a problem with just the design of the champions themselves? It wouldn't be hard to make a champion that would do just as well or better in the jungle than in lane, without mana costs, and be AP... Think if his Q did bonus damage to neutral monsters instead of half -_- Or does riot just dislike AP jungles unless they are tanks?

Edit: ok, let me clairfy something, the reasoning is obvious. AP almost always has to manage both health and mana (assuming no blue buff). Some of the things that attribute to this is the lack and poor effectiveness of spell vamp; because it's a very expensive stat for very little pay out. The other is damage distribution, most AP champions have terrible clear speeds due to their poor early game damage on their skills and poor damage without the constant use of their skills.