So just because you can point and click away with Zed, doesn't mean you can use it intelligently. Some players will abuse champions abilities but with bad timing.
Scenario 1: Fizz dodged 1 ability, but the opponent has an ultimate waiting. Gz! you were able to easily dodge an ability, but still got baited. (Possibly dead)
Scenario 2: Fizz takes an ability, but dodge's an ultimate.. (Possible kill and leaves a larger window for counter)
Pressing abilities is easy, but to tie them together to make the champion work, is an entirely new struggle.