I don't think you understood what i was saying. There will always be a "best" way to play, because of math. That might change depending on how riot decides to make changes to the distribution of health and damage in the jungle and such. But, the numbers can't be tuned in a way which utterly removes the viability of anything that doesn't resemble that most optimal way, because that doesn't allow for individualized play.
I'll use world of warcraft as an example for this, because it's easier to construct a hypothetical situation, although any type of hot bar RPG would work in this example.
Consider you are playing a class. The optimal stat for that class is (in the case of wow) crit. Then with that the optimal rotation is rotation X. So the best possible way to play the class mathematically is to max your critical strike and follow rotation X.
Although in rotation X, you have to manage a buff on yourself, but you aren't very good at that so you can't preform rotation X to max efficiency. It's therefore less effective, than if you used rotation Y and stacked haste instead. You're maximum potential damage would be reduced, but your actual damage would see an increase, because the rotation is easier for you to do.
So i then ask you which rotation is "best" X or Y?