In a world where every market participant was perfectly informed and perfectly rational, and always acted in perfectly enlightened long-term self-interest, then

In a world where every market participant was perfectly informed and perfectly rational, and always acted in perfectly enlightened long-term self-interest, then you might have an argument. We do not live in such a world. Your Feynman anecdote is a rare exception rather than a norm. Tech companies and software engineers will give up their racial and gender biases only when absolutely forced to, and at the moment nothing in the market is forcing them to -- you might not become the most profitable company in the world, but you can have major bias and still do well enough that it's simply not perceived as a problem for the companies which do it.