Its just an instance where tankies can exist in an echo chamber without having to critically think.
If you want you can read some of my comments here and watch these morons make fallacious argument after falacious argument, put words in my mouth, and project some person who makes similarly bad takes which exists inside their head onto me: https://lemmy.today/comment/17304484
Edit: there’s also this thread: https://lemmy.today/post/32415724/17304693
As you conceded it’s a echo chamber but it doesn’t isolate people from the realities of their daily lives.
I wouldn’t really call that an echo chamber, then. An echo-chamber is where you are only exposed to one side of viewpoints, that’s largely impossible for Hexbear users but is entirely possible for, say, Lemmy.world users. The alternative is to let liberals, fascists, etc roam freely, harassing users and creating an unsafe space for marginalized comrades that use Hexbear precisely to avoid such situations for a tiny portion of their lives.