I can count on two hands the number of women I would feel comfortable giving the exact same feedback to as I would a man. Women I can be candid with are women that I have 5+ year relationships with, have backed in some way, and who know I am truly looking out for them.
And the solution is blatantly obvious, but completely unpalatable. Let men grow the same way we believe women and minorities should be allowed to. A male engineering manager being too harsh with a female junior dev is a learning moment for the director of engineering to help the manager, not fire them.
And crucially the line is shifting more and more about what's "obviously fireable." Turns out harsh criticism of the quality of someone's work and the lack of improvement are rational, not an ad hominem. Those things are fixable. But criticism from powerful parties is now scrutinized as dangerous based on identity rather than for the content of the criticism.
If you are already invested? I find it's pretty easy as I really am only looking to back people who are open-minded, receptive and coachable in the first place as I hope I am. One of the most common criticisms I make is that someone backed the wrong head of sales, head of growth, etc. and folks almost always hear me out because I can be quantifiable (sales metrics) and bring a solution (someone better).