Riot, I think you've been quite successful in achieving strategic diversity, except for the jungle
Your goal of achieving strategic diversity has been quite successful I would say. Currently there are many viable picks and strategies seen in the LCS, more than any other season. But, only in 4 roles.
The jungle is still a very static role with the same power picks being picked over and over again, overshadowing other picks. Changing jungle items to allow for strategic choices in the jungle did not work in making the jungle a good place for champions other than the ones with heavy damage, CC, utility, tankiness, and mobility at the same time. I expected that to happen honestly.
Riot, you have a long road ahead for allowing diversity to become a trait for jungle picks, with equal power level and tradeoffs between all junglers. The first step in my opinion is to reduce the power of current dominant picks.
