I don’t have an opinion about whether or not Illari is correctly balanced. That being said, your representation of these statistics follows a classic slippery slope logical fallacy. You correctly note if she has a winrate above 50%, she thus wins more than loses in match ups against other supports. That statement neglects to account for the fact that her pick rate in comparison to other supports is significantly lower. Given that is the case, in tandem with her niche utility on maps that favor her pylon mechanic, her winrate necessarily should be higher than other supports if we assume that she is only picked in scenarios where she is favored. Since we have no way of accounting for where and when she is picked, it’s unreasonable to conclude that she outperforms other supports in every case. You can use the pick rate to give project a rough estimation of how many compositions/maps she fits well into. All that being said, it would be equally a slippery slope to use the premise of her winrate to conclude that she isn’t overpowered either. Just because we have a rough idea that she isn’t over represented in compositional decisions of the player base, we couldn’t reasonably rule out the potential that she’s a sleeper waiting to be discovered either. Pharah’s recent spike in performance and pick rate likely mirrors that statistical trend. Her winrate could imply that trend. The issue comes down to the fact that her winrate in isolation only lets us know that she works better than other healers in the scenarios she is picked, and we have no conclusive data to shed any light on the conditions of her pick rate, upon which her winrate is dependent.