That’s certainly one way of looking at it, but those who think humans walking around armed with half an understanding and making claims about reality is a recent thing would, on face, seem naive to thousands of years of history. Nearly every scientist was persecuted in their time (worse as you go further back in time) because the entire world thought they knew better. Wouldn’t you consider climate exchange advocates to be in an echo chamber? What about Nazis, or towns with high klan membership? Were they not living in their own echo chambers too? Every “movement” and belief system is a de facto echo chamber; no one has a meeting to promote their ideals by spending the entire time sharing contrary facts. In fact, wouldn’t it have been even worse the further you go back in time because contrary information was primarily distributed by singular people? People weren’t exposed to thousands of contradictory facts that went against their beliefs; they just ignored what Tommy had to say because they knew better. They had their one set of facts they believed and judged whether what another person said was truth mostly by character and how it aligned with their beliefs, and rarely because it was truth. This is still true today. Change only came as the number of people they encountered who were saying the same thing increased; again, not because they were right, but because they were saying the same thing. Young Margret had no way of calculating the trajectories of planets or evaluating the science of gravity; she just had to trust others explanations of how things we can plainly see are the result mystical magical forces. The only thing that has changed is the number of people we are exposed to who are saying the same things, right or wrong, but what hasn’t changed is the number of people who were believed things and repeated them…right and wrong.