> Assuming that online dating works magically well for gay/lesbian folks but doesn't for straight people seems like a really large leap to make and also seems really untrue from what I've heard

Of course it isn't perfect for all of them, but it's a much less dysfunctional market than the straight one. Which means there's less of a business model in catering to gays and lesbians there (doubly true given that they're rare.)

And yes, in theory, straight people can date bi people, but again, by not perfectly serving that bi market you cut off a tiny fraction of your clientele. Screw up the straight market and your site is doomed. Which should he focus on?

> What I did say was that the way the site felt it felt like it was designed with a pretty narrow frame of how dating worked

Yes, that's called "targeting a particular market."