I expect effort to yield proper reward, and lack thereof to have less reward.
Automatically aimed, unmissable, resourceless attacks that (often) fire off more than twice a second at absurd range with little to no drawback, no counterplay, the highest sustain, the highest damage (short and long-term), the highest item diversity, an item to cover for any weakness or fuckup, an entire class dedicated to keeping them from killing themselves...
In short, the easiest, most reliable class in the game. <-- THIS SHOULD NOT BE REWARDED
I expect braindead champions like ADCs to have severe drawbacks for being so braindead. If they don't want to put in any effort or thought, then they should not be rewarded for that. If they wanna have the highest damage, they need to lose their sustain. If they wanna have the highest sustain, they need to lose their god tier damage or range. Something needs to give, and they need to be overall weaker than harder champs.
But, as it is, the competitive pool is only ~40 champs for a reason. No reason to play the more complex champs since they do less damage and are less reliable -- just gimping yourself.