It seems Lemmy is as much of an echo chamber as anywhere else. Even when I agree with the hive I like to read differing viewpoints, but there’s no easy way to sort through them here. We can’t be well-rounded when all we see are the same opinions endlessly reinforced in discussions.
It’s not much of a concern so far. Threads are generally small enough to read through, but some (especially news) threads do get quite large.