> And if all biases were taken into consideration, everyone would (and should) score exactly the same on everything, regardless of age, sex, race, gender, ethnicity, orientation, etc etc.

"Should" is the operational word here. It is a normative decision that these (protected in many jurisdictions) classes should not receive any different treatment due to membership in the class. I agree with this goal, it seems you do not? Or are you objecting to a normative decision being disguised as a descriptive one? In that case I think it is largely a straw man, it's not how most people actually think.