If "luck" is involved, it is the luck to be born into families and communities whose values and choices turn out to be productive for themselves and for others who benefit from the skills they acquire. Observers who blame tests or other criteria for the demographic imbalances which are the rule-- not the exception-- around the world, are blaming whatever conveys differences for creating those differences.
They blame the messenger who brings bad news.
If test scores are not the same for people from different backgrounds, that is no proof that there is something wrong with the tests. Tests do not exist to show what your potential was when you entered the world but to measure what you have actually accomplished since then, as a guide to what you are likely to continue to do in the future. Tests convey a difference that tests did not create. But the messenger gets blamed for the bad news.
Similarly, if prices are higher in high-crime neighborhoods, that is often blamed on those who charge those prices, rather than on those who create the higher costs of higher rates of shoplifting, robbery, vandalism and riots, which are passed on to those who shop in those neighborhoods. The prices convey a reality that the prices did not create. If these prices represent simply "greed" for higher profits, then why do most profit-seeking businesses avoid high-crime neighborhoods like the plague?
It is painful that people with lower incomes often have to pay higher prices, even though most people are not criminals, even in a high-crime neighborhood. But misconstruing the reasons is not going to help anybody, except race hustlers and politicians.
One of the many disservices done to young people by our schools and colleges is giving them the puffed up notion that they are in a position to pass sweeping judgments on a world that they have barely begun to experience. A standing ovation for childish remarks may produce "self-esteem" but promoting presumptuousness is unlikely to benefit either this student or society.