The problem is that some, if not most, of the forbidden criteria carry real and useful information, hence there is a ever growing (proportional to the heavy handedness of government or corporate regulations) incentive to find creative ways to covertly take them into account.
Best person for the job =/= best qualified judging only by the allowed criteria
Either that or they could just hire the best qualified candidate for the job.
The problem is that some, if not most, of the forbidden criteria carry real and useful information, hence there is a ever growing (proportional to the heavy handedness of government or corporate regulations) incentive to find creative ways to covertly take them into account.
Best person for the job =/= best qualified judging only by the allowed criteria