The Upcoming Preseason will be the most unbalanced state League will have been in since launch.
And I don't mean that to disparage Riot.
The core fact is that the rune system has been in place since 2009 and beforehand. It's a system that has become core to the identity of league. The numerical bonuses can make or break certain champions and Riot has always balanced around an optimal runepage with around 1k extra stats. With the preseason rune changes, we're completely scrapping a numerical system and mastery system. Everything is likely going to be VERY weak in comparison unless Riot does a sweeping stat change to any/all classes.
I don't say this to talk shit but I say it to be aware. Because nothing is going to compare to the gutting/utter change that we're going to witness here.