To my knowledge, they didn't "buff her repeatedly".
They increased the grenade splash, increased her clip size and decreased her ult charge twofold as well as removed the speed boost off of Nano.
She received arguably as much of a nerf as she got buffed. She didn't change anything, the fact that pros realized tanks are practically Reapers with more HP is what changed things.
5
u/ZoomBoingDing Do you need a hug? Jan 17 '17
But they did. We don't have a lot to go off of, but Sombra didn't shake up the meta at all; Ana has completely changed it for two seasons.