Maybe you need to read what I've written. I know that I'm not part of his world but I at least understand there is a world outside of what I do. He just thinks that everyone here is the same as him and what he does must be the only thing in software development.

I apologize if it came off caustic - my point was purely understanding, to not be critical of his 'bubble' while admittedly working in one of your own.

That insight should help you understand the relevance of LinkedIn because it operates across 'bubbles'.

I'm all in favor of replacing LinkedIn with something decentralized (or just less exploitative), but isolating yourself on GitHub (which is not even the software dev industry but a minority subset of it) is not a solution, it's immature clique-ish behavior.