How did Google change its promotion policies based on the data? From my time working with Google it felt like there were a lot of bullshit artists in management. To be clear, there were also a lot of bullshit artists among the engineers too. Very few people were engaged in using their time productively.

It's very fortunate for shareholders that Google has a cash-cow business, but to the article's point, once bullshit starts to expand within an organization the only true long term control on it is outside the organization ... competition and forced reform, or competition followed by death.