Lemmy's notoriously awful for bugging out on displaying content. Search up anything and eventually you'll see it bug out where it simply won't display the results.
I mean all of Lemmy is an echo chamber of one kind or another. Although there are certainly varying degrees. I don’t know anything about Hexbear but lemm.ml is the worst I’ve seen due to the heavy-handed behavior of the admins.
While I wouldn’t say I like the instance users I do get some value from engaging with tankies, personally. They have a unique perspective and it motivates me to learn more about aspects history and politics that are not always discussed by other groups of people.
The big problem is that I’m not allowed to correct their misinformation. This makes honest discussions and learning impossible on the .ml instance. Since my instance is defederated from grad and Hexbear I have little knowledge of their space. When you say I wouldn’t like it, is that due to the users or due to the way the space is moderated? Can I go to these spaces and offer a respectful dissenting viewpoint? Personally I find that to be a very significant distinction. I don’t mind being the bearer of unpopular truths—in fact it gives me a certain satisfaction. But I will not tolerate spaces where the truth is completely silenced.
Thankfully this community isn't an echo chamber. Tankies are more than welcome to talk about communism and capitalism, so long as they don't start encouraging or justifying violence.