>That assumes there is no systematic bias. Which clearly there is.

This is a non-helpful statement. Humans are bias machines. We function based on our collective experience or in some cases differed experience. Saying there is systemic bias doesn't really add anything other than saying exploit what ever bias you can find to your advantage.

And receiving that feedback helps you realize if there is any bias and adapt accordingly.

Sure, there may be, and you will have proofs that it exists and may find a way, how to handle it.