Except that that won't actually improve hiring outcomes, if by "improve hiring outcomes" you mean "hire more individuals from historically marginalized groups".

You're saying that hiring is a pipeline problem. And that's true. But every prior stage of the process, including the stage where children are too young to enroll in kindergarten, exhibits exactly the same pipeline problem. There is no point at which there are enough "qualified individuals from historically marginalized groups" to meet demand. If you want "improved" hiring outcomes, the only thing you can do is accept that better hiring means worse on-the-job performance.