I mean - this seems like you don't actually use the service. I do JS development, and I can pretty reliably get someone like Dan Abramov or other JS 'rockstars' to look at/comment on an issue if it's required. Additionally, I can see these people interact with their peers and discuss ideas. Fundamentally, twitter has become a platform for idea exchange and conversation that has professionals on it, discussing things professionally! It doesn't really get more meaningful than that.