Turret siedges are the worst part of the game and they are enforced by lack of proper itemization
Right now, LCS is plagued with 50 minutes long games and countless 5v5 siedges... Its both boring and painful to watch. If teams go even, 90% of the action is Aoe mages cleaning up the minions in seconds and then wait for a new wave, and again, and again until one of the teams makes a mistake.
The problem is, if your team doesnt have a fed duelist that can split push, there is no other way of putting pressure on the lanes. As long as there are no viable tools for pushing, Aoe mages will remain a compulsory pick for majority of the team comps.
Buff the Banner of Command so it becomes useful. Give us a way to reduce aoe damage dealt to minions. Buff tier 3 upgrade Capitain for boots, so you can manipulate the speed of waves more effectively.
LoL has a potential as an esport, but siedges are incredibly boring to watch