Lets Be Honest Here.

Ask yourself this.

Will League of Legends be fun after every champion gets "Balanced?"

For this example, I'll use Annie.

Annie's ult gets a "1.5 second cast time" rather than just instant. People are able to flash, or dodge, the ult in time. Her ult is no longer a "Point and click."

And what do you have there? What people has been asking for. "Balance." Then people will complain about her being "dumpster'd" or "trashed." And the cycle goes on, and on.

Well, How About Riot Nerf her damage?

People will still complain about her instant cast time, point and click, and aoe. Even if she isn't as useful as a AP carry, she still has the support role, where damage isn't a necessity. She can still make plays in team fights, where the game is either decided, or tide-turning.

If every champion was balanced, League of Legends would be boring. Think about it.

EDIT: I just used Annie as an example. Nothing against Annie. Seriously.