@Meddler; I believe Your reasons for removing Syndra nerfs is flawed.
You say Syndra avoided the nerfs she was going to get because her pick rate and ban rate decreased. That i find is a poor excuse not to nerf her.
The fact of the matter is her pickrate decreased because the assassin update offered an even larger verity of unbalanced champions to play in the mid lane. And the only reason her ban rate decreased was because the Assassins which as still unbalanced need to be prioritized for bans before her,
Lets face it. Syndra still needs those nerfs. If we were to implement the 10 ban system i guarantee Syndra would find a spot among the top bans again no problem.