Well, by that rationale, the worst your hiring process, the more you gain by stack ranking once. But, even if you hiring people by tossing coins, if you don't have huge teams the results won't be fair.
Yet, just defining a minimum performance and firing the people that don't reach it outperforms that first application of stack ranking. And you can apply that filter as many times you want, with no loss of quality.
Yet, just defining a minimum performance and firing the people that don't reach it outperforms that first application of stack ranking. And you can apply that filter as many times you want, with no loss of quality.