GAW, I think we need to define “bias”. Inequality is a given. The question is whether inequality is based on pure logic, or personal bias (negius). I think you’re defining bias as an opinion based on personal experience. I trust R’ Meir’s finely tuned Torah mind to incorporate his experience into his value system to come to a Torah true worldview. It’s not based on negius; he would have come to the same conclusion had he observed it in someone else. Call it a “bias ne’eman”. This is how I think the T’T might explain himself.
YCT are accusing Chaza’l of considering women unequal not because of an actual Torah truth, but because they were men, and did so to inflate their egos. Even taking out that last part about egos, it would cast light on Chaza’l in such a way that we couldn’t trust them for anything. Not only is this bizui T’C, it’s kefirah.