Why would people in Texas want to start a local group of Texas Bitcoiners? Because they have shared interests and want to find like-minded people to connect and build community. Same thing here.
And, of course, Henhouse is NOT segregated from the rest of Nostr! (or else how would I be replying to you? 😀 ) I encourage you to read the rest of the post to learn how it works. It provides an *additional* subcommunity to find other women, not limiting users to only interacting with other women.
Thanks for asking! I'm sure many people will have similar questions.