Riots Problems With Balance

I think the main reason that Riot has trouble balancing champions is because the more recent champions have overloaded kits, making the older kits not as good. The only reason an old kit like becomes broken is if an item is added . The most recent Champions kits have so many things packing into them that they are either going to be weak or over powered.

Of these Champions, many are op or have overloaded kits Ok, but when people learn his ally saving ability will be annoying Overloaded Extremely Op upon release, not as overloaded as Ekko Bard is actually ok, he is hard to play well, but has defined strengths and weaknesses Dash, dash, dash. Overloaded I don't play gnar, but having two forms makes it harder to balance. It allows for some the potential to be overloaded, but do to the unreliability to switch quickly I think he is ok Braum is good, at release he was a bit to strong, but that is marketing Balanced, definded weaknesses, but really solid strengths Overloaded, but nerfed so he isn't that strong anymore.

Why can't riot just make simple champions like Vel or Braum? It would make the game easier to balance.