Earlier quoted context omitted.
Didn't decades of that policy at Microsoft prove that it doesn't work? People then optimize to make sure they only work on projects to keep their score up.
Basic math too. Suppose “ability” is normally distributed in the population and in your initial team too. Replace people when the new candidate improves the team’s median ability (supposedly what Amazon’s “Bar Raiser” checks). I kicked together a simulation of this process. The first replacement is pretty easy (50/50), but the hundredth hire on a team of ten often takes tens of thousands of interviews, and sometimes…
Mostly interested on how you even create a simulation like this.