I am a volunteer mentor for Hackbright, having worked with their students over four different sessions. My work involved meeting with my students weekly, supplemental teaching,guiding them through their final project, and career and hiring support. I have also hired two Hackbright grads (not any of my own students - they all got hired elsewhere).
All of the women I worked with came in with zero or close to zero programming knowledge. All got hired as developers after the program. Everything else aside, this is a win.
We can speculate all day about whether women need "safe spaces" or waxphilosophically about whether or not this is segregation.
What we do know are facts: (1) There are far more men than women writing the software we all use every day. (2) Some women - for whatever reason - thrive in an all-women environment and would not have thrived in the usual mostly-men environment. I'm not going to speculate or make generalizations about women or men. What I do know is that many women have thrived at Hackbright and become excellent software developers.
Results matter most, and Hackbright (and other programs like it) are bringing women into software engineering. I don't think we need to overthink it. It's not for everyone but it works so I support it.