If Hubski were an echo chamber I wouldn't have to mute 58 people. Seriously speaking: NOBODY seeks to spend time with people they disagree with other than trolls. If you have friends with differing opinions about something, chances are good you started out with a great affinity for something, a lot in common, and a general worldview that aligns... and then when you found your differences, you explored them together. That's what communities do. Those people whom you have nothing in common with: You're not going to learn anything from them. You start your discussion on a war footing. That's what humans do. Progress is not made by mashing polar opposites together and making them fight. Progress is made by putting people who agree 90% together and then giving them the room to learn about the 10% they don't see eye-to-eye on. Hubski is pretty good about that.