Echo chambers in the real world are called cults. They tend to get more extreme by cutting people off from outside voices and only communicating among themselve

Echo chambers in the real world are called cults. They tend to get more extreme by cutting people off from outside voices and only communicating among themselves, until they get ready for the space ship that's supposed to take them to paradise and hand out the Kool Aid. Echo chambers are where development dies. You won't be challenged, you won't discover new thoughts, you'll remain stagnant. I'm sure it's more stable, but it's the stability of a stone age tribe being left behind while the rest of the world advances.