Hence the quote, "Issue queue or it didn't happen." That was Drupal's idiom and it still applies to projects in general.
While all of these other communication mechanisms are great, esp. for hashing things out more effectively in real time, it's absolutely critical that a summary of what was talked about make its way back here for the benefit of those who couldn't be there, including Google, and yourself 2 weeks later when you totally forget what you talked about. :P There needs to be a URL to point people at who have questions later on. However. As a text-based medium, the issue queues are an ABSOLUTELY HORRIBLE medium through which to have a heated discussion about whatever. For that you turn to one of the others.
https://www.reddit.com/r/drupal/comments/1qz9l9/i_am_angie_w...