So-called objective metrics in academia disadvantage women. Letters of reference for women tend to have less stand-out adjectives. Women's papers are cited less, their grants are smaller on avg & their papers have a harder time getting past reviewers.
https://www.livescience.com/human-behavior/the-first-author-was-a-woman-she-should-be-in-the-kitchen-not-writing-papers-bias-in-stem-publishing-still-punishes-women
https://www.livescience.com/human-behavior/the-first-author-was-a-woman-she-should-be-in-the-kitchen-not-writing-papers-bias-in-stem-publishing-still-punishes-women
'The first author was a woman. She should be in the kitchen, not writing papers': Bias in STEM publishing still punishes women
"What is the hard evidence, beyond anecdote and suspicion, that unconscious bias impacts on women's careers? Increasing numbers of studies show, in many different guises, just how potent such bias can be."