Any community is going to be an echo chamber around something.

HN is generally a "tech is good" camp, given that we're all in tech. We might recognize boundaries and nuance in there, but most HNers generally believe tech solves problems (myself included).

The concern imo is when a network, say your Facebook friends, ends up becoming a secret echo chamber without understanding it. Instead of realizing you are engaging in a biased group you assume you have a representative sampling and that people who disagree with you are the outliers.