Riot, there can't be strategic diversity as long as games are decided by first blood/dragon.
As long as one team can easily stomp the other due a few early kills we won't be seeing the variety in strategies that you guys are aiming for.
A losing team can't worry about how they want to win the game, or how to best execute their strategy because of the pressure of not having enough farm, or getting caught and falling further behind. Team need room to breath. Right now the only and best strategy is getting that bf or first dragons of the game, then proceed to deathball through the now super weak towers.
If you guys want to see strategies you would have to make the game less snowbally, this is why different strategies work in games like Dota where an early lead may not mean much, losing teams have a better chance to play their cards right and even turn the game around.