It's not that they change things based on trials being "for the 1%." It's that they make the changes based on what they think the top 1% of players want from the game. Which is slightly flawed, because they don't actually do it correctly or they hit things unnecessarily. But they do need to listen to those players, as they are kind of the experts on how things actually function in the wild, which is insight that all the in-house testing in the world can't provide.