[throwaway894345]

I think the pipelines are pretty inelastic when you consider that most companies are competing to hire "diverse" candidates from the pipeline and the limits of the sort of training you propose (training might work for candidates who are already pretty well educated and highly interested and motivated to serve in an entry-level position, but you're not likely to have broad success training high school graduates for senior level engineering positions). Consider how much time, money, and energy FAANG companies have spent for so little difference in their demographics.

Moreover, the point of my comment was how the EEOC's notion of discrimination is pretty much "whatever we think is discrimination", so companies have to compete to appear not to discriminate, which manifests as increasingly giving preferential treatment to minorities without actually running afoul of the law as interpreted by the courts. So even if tech companies adopt your suggestions this year, next year they'll be the standard and companies will have to find something else to stay compliant.