"Biases" are a species of uninformed preference. It is really unlikely that satisfying your biases is going to lead to better decision-making. This goes for just about any mismeasure and folk wisdom, as Google has found out.

Multiple dimension of Google's hiring process have been revised as they found they were getting sub-optimal results from the usual kind of "hiring people like me" approach.

For example, it used to be a good bet that men made better orchestra musicians. Until they made auditioners take off their shoes and play behind a screen. You can't detect that bias without trying very hard to wash it out. If men were substantially ALL of the successful orchestral musicians, it would of course look like a completely justified "bias."