Training mode

Why doesnt riot create a concept for micro mechanics that can earn you small rewards like blue essence. I was thinking having it be like a mini game. (I.E. dodge said amount of skill shots, land set amount of skill shots on moving targets, cs mini game where you have t9 hit a certain amount per wave. Even a training mode where you practice certain champion rotation mechanics?) I feel like its beneficial to old and new players alike. Plus it would be fun and help you get champions faster while still working for it.