The problem with stack ranking at places like microsoft was twofold. First small team managers were forced to rank their reports, and each manager had to get rid of the bottom 10% each year. If you had 20 employees you had to fire 2 employees each year. But statistics doesn't work like that, there were many microsoft teams with all productive employees. And there were probably teams where 30% of the group should have…
This is well documented behavior, even in Jack Welch’s book. He was the one famous for cutting 5% every year at GE.