Ashe hasn't been changed in a long while but she works. When you buff a champion out of nowhere, they become the next dominant pick that everybody on boards complain about. They're picked or banned every two games, have a 54% win rate, and this continues for several patches until the balance team catches on that maybe the champion is too strong.
Then they nerf the said champion to a state worse than before the buffs. Because that champion shouldn't have been buffed in the first place. Of course, there are certain exceptions in which Riot will favor certain champions and keep them buffed, or have nerfs that really don't make a difference.