Effort vs. Reward

In, you know, literally any other game... the simpler, easier tactics are usually the weakest, but are reliable. While the more complex tactics may not be as reliable, they are vastly more rewarding if used well.

In League, the simplest tactics (ADCs, Yi, Jax, Win Nhao, Graves, Ahri, Mundo, etc.) are, BY FAR, the strongest, while the more complex tactics (anything AP really, some AD casters that aren't based aren't based around autos) are jokes in comparison, and lack in every regard.

Tell me how that's "fair" -- I want to know.

... oh, but it isn't fair, so you can't tell me about how it is.