Many champions not competitively viable for years, almost completley ignored

Many champions aren't viable at the competitive level for reasons that go beyond their balance. Katarina, for example, is designed to exploit mistakes in communication and CC use, while Fiddlesticks capitalizes on failures of vision. While this is fine for the rest of us, these are mistakes that pro players only rarely make: nothing short of an obscenely large buff could make these champions viable.