At some point people have to realize that the balance team probably plays this game, and like everyone has biased.
They may not have an all encompasing desire for ALL THINGS to be equal.
Its entirely possible that they have a majority that sees things one way, and favors certain playstyles and champ types.
If you worked on the balance team, whould you "balance" your favorite champ just based on some numbers from the system? Especialy if you were one of the people who gave input on a rework on that champ? Maybe you would... Can you have that much faith in everyone?
This is what "Riot" wants for the game, or at least the people who "balance" the game as it is right now, and I can only assume that the people will have to change that "balance" the game before the gamescape changes.
*EDIT: Also another thing Iv mentioned before, flavor of the month champs bring in money from people who spend RP to get champs and skins for FOTM champs.... So, Riot buffed AD to sell AD champs, and skins, because people must have been buying AP champs and skins... then then slowdown, time to bring in the cash with a FOTM refocus.
Simple economics really.