If I agree with you right here and now, have we not technically formed our own 'echo chamber'?
Echo chambers from the outside look like inside out fishbowls because they are. But every set of agreeable statements, whether shared between individuals or distributed through time, same system - pieces are just labeled differently.
However, I do understand the emotional feeling that occurs when conforming is heavily pressured, from nearly every side. That's disharmonous emotionally to the people it is disharmonous to. The ones who get silenced.
I understand both sides. Can't say I know more than that. Can't say I have an opinion on the matter because it goes beyond the facts.
Another way to look at the problem: are math and logic an echo chamber?