In my experience, emphasizing efforts to avoid being an echo chamber tends to lead to slowly becoming a far right echo chamber, as people end up tolerating intolerance until the victims leave for elsewhere and only the intolerant are left.

Hivemindiness and issues are probably inevitable, as anywhere, but I think the lack of a downvote button goes a long way towards mitigating that, to be honest. It limits the degree to which the community can bury or punish a comment just for saying something like “I didn’t like popular game xyz”. And people who would actually deserve that kind of downvote rain should typically probably be booted anyway, per beehaw bee nice rule.