You understand, don't you, that your implicit assumption
here is that there just aren't enough competent non-
straight-white-dude speakers to fill out a conference
list?
I think you're deliberately misrepresenting the OP. The way I read the OP, they are making the assumption that for every single identity group in tech, that the prevalence of great speakers to bad speakers is approximately equal. For shits and giggles, let's say that assumption is 2% of white guys, 2% of white women, 2% of black women, 2% of black men, 2% of asian women, 2% of asian men, 2% of trans people, etc. etc. etc. are no only competent by talented speakers you'd want to see at a conference.
The moment you intentionally ignore base rates of the availability of each group, you're no longer getting the 2% of the engineering population that are the best speakers regardless of their identity. You're instead optimizing for diversity over technical excellence. Nothing wrong with that, just be clear that you can't optimize for both unless the base rates for all groups are approximately equal or unless one identity group actually have a greater percentage of technically excellent speakers than another identity group.
That said, I don't really care about conferences either way, just statistical truths. I rarely go to conferences any more, since I prefer reading code, papers and technical writings that are shared based on the quality of content instead of the identity of the author.
In my experience, the conferences that work really hard on
diversity are better.
I'm really curious to know your definition of "better" because I would venture that both you and the OP are completely correct in your viewpoints and arguments, because you two don't share the same definition of "better". Those conferences are better based on your criteria of better, but may be subjectively worse for the OP based on their criteria of better.
FWIW, I'm a non-straight "white" dude (half anglo, half latino (by way of iberian and mediterranean descent) (more specifically a anarchoamorous, pansexual, agender male with a cisgender visual appearance because I don't see the value of wearing my identity on my sleeve)