> more than just repeating ideas back and forth.

Yes, people on X seem very upset that they can be blocked on bluesky. But if I've heard what you have to say and don't want to hear the same thing 1000x, that's not an echo chamber. That's me hearing you, disagreeing, and you having nothing more of value to add.

Discussion requires communication, not simply repeating propaganda over and over and over, which is 99% of the time all that anyone crying "echo chamber" tends to do.