I think the problem isn't echo chambers as a concept, but as a constant. Having a space where you feel welcomed is so important, and the magic of the Internet has always been that if you can't find that space IRL, you can probably still find it online. But corporations have realized that a feedback loop of things people want to hear is the best way to keep people on and looking at ads, so that's what they push. It's gotten to a point where the sites that most people spend the vast majority of their time on will automatically, algorithmically create those echo chambers with no option to turn them off. Many of them will refuse to serve any content at all if you try to log out or view things through a VPN. And it's that enforcement of echo chambers that is really so dangerous.