I just wish people would use a system that's integrated into where the code is. I don't want to have to register for a forum when GitHub has a perfectly good ticketing system (and now discussions), and yet I have to register at another place where my details can be leaked from because who knows the technical capability of this one single person who may or may not have done any security. If it's a company, please have…
Counterpoint. Other companies absolutely suck at making forum software. It's because it's not their core business, so why would they put more than token effort into it?
Edit: upon re-read this seems to be exactly what you are suggesting, so please disregard my reply. The solution here is a forum set up with robust and plentiful SSO solutions, so existing authentication providers can be used.