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It's not bias to make realistic decisions. The problem is that in Bayesian terms, if your goal is "maximize the intelligence of employees", you are better off betting along racial lines. The counterargument is and has to be "playing a wider range wins more profit".
Top pair top kicker wins most hands against most players in poker. A similar intuition needs to be developed to prevent current employers from shriveling up into brainless nits. There may be specfic contexts where ultra-tight is right, but this isn't the vast majority of contexts
