Balance
Sure would be nice if that existed in League -- but, unfortunately, balance is not lucrative in an F2P cash grab run by greedy fucks, so it will never exist.
Instead, we get blatantly OP champs that Riot ignores or even buffs because they're popular and making money, we get entire classes of champs that can't even compete due to them being gutted, we have repeated buffing of AD champs (that don't need it), we do not have viable AP junglers anymore, we have 2-3 viable champs per role, and so on.
Yet, Riot continues making money off of morons that can't think beyond how shiny something is or what everyone else is doing. I sure do love watching the entire gaming industry die thanks to both the morons and greedy fucks that exploit them.
is currently the best jungler in the game.

