You want to prevent echo chambers? You have to stop allowing people to block others. Forcing people to see and interact with shit they don’t like prevents echo chambers. Allowing blocking just enforces echo chambers.
For the record, I’m not for disabling blocking. Algorithms are a whole other piece of that echo chamber puzzle.
Many people in the SEO industry have really been calling Google out publicly for this pretty hard and consistently for many months now. Glad they finally listened.