It makes sense to start with overt discrimination, that's a lot more clear cut I'd actually go further and say that banning nebulous forms of bias really just

It makes sense to start with overt discrimination, that's a lot more clear cut I'd actually go further and say that banning nebulous forms of bias really just makes work for consultants and other rent seeking that tries to craft arguments that some statistical result is or isn't biased. If an organization wants to do that, fine, but government and law should not go down the road of making general rulings on handwavy stuff. In a specific case, the courts are always an option.