I meant AP mages generally. You screw something, you are out. It's utter BS to ever expect somebody splitpushing or taking dragon with Ahri, you'll either assassinate people if they are bad, or stay with your team that has to do something.
Even simplier, because it MAY fail, and enemy almost always has somebody that CANNOT fail, every time you are trying to make plays like that you have chance to screw your game. If you miss one of ten, it *might* mean you would win 10% more games as AD character.
This is the part where playing fighter is much easier, as you can actually do get those global golds for your team if you are ahead, and in soloQ it's huge, because you ALWAYS must count with fact that teammates may fail or be just straight bad.