Footnote one should be put more generally, biases in the performance metrics (either appearance for women vs ability for men, or how many words of the US nation

Footnote one should be put more generally, biases in the performance metrics (either appearance for women vs ability for men, or how many words of the US national anthem someone knows for US citizens vs rest of the world) will cause this method to fail. Unfortunately, unbiased performance metrics are quite hard on single dimensions, let alone when moving to multi-dimensional metrics