Just make every ability in the game targeted.
Because, really, skillshots and complex mechanics are just a willing handicap. There is not one champion in this game who relies on skillshots that can out-damage a champ with absolutely no skillshots or mechanics to speak of.
So just make every champ into a braindead, boring as hell mess, because obviously that's what you want us to play, Riot.
... Or, you know, you could make the harder champs more rewarding to play than the brainless ones, but that wouldn't be profitable enough for you -- what snotty kid (and adults fit into that as well) would pay through the nose if they had to actually try in order to win? Yeah, none.
So, good going, F2P. Sure do love you.