After that, he spoke about figuring out how to provide the most value for the business. I've had a 25+ year career and can verify that everyone should follow this advice.
Whatever hidden biases we are concerned about in the workplace, they all pale in comparison to the metric of fulfilling the purpose of the company. It took me a few years to realize that businesses were less interested in paying me because I was smart and could solve hard problems and more interested in how I could measure and move the purposes of the company.
The only direct value a manager provides to a company is a regular calibration of employee purpose with the purpose of the business. This is best done with regular 1-on-1s, not through semi-annual reviews.
There are other indirect things that a good manager brings to the table which mostly revolve around increasing employee happiness and satisfaction, but all of it pales in comparison to aligning employee and company purpose.