As a 6 Lol player I can only say; What happened to _**Simple Design**_ League had? no idea. Everything just moves too fast. When you start a game you have to pay attention to at least 4 different dragons, 1.5 barons, the 4 major camps, map position of enemy champs and trinket/ward timers. Not to mention over time the extra added mechanics of each champion. Even the simplest ones (Annie, Ashe, Garen) have become very complex. Only Rammus is still the same.
I am confident right now dota2 is much simpler game. I can only blame e-sport but no idea why riot are shouting themselves in the foot (to make the game more "interesting" to watch).