Scarra's in-depth thoughts on the rune rework and how it's affected long-term game balance
In this video, he mostly talks about damage creep and how that has affected many other facets of the game, how varied League is from match to match now, good and bad implementation of RNG, and the illusion of choice.
Very interesting insight into the state of high elo right now, although I personally don't agree with his suggestion for solving these problems.