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yeah that's true, can definitely see that. doesn't matter if it's upvotes only or both, the end result is echo chamber type situation.
I like that idea a lot of the default sorting, as long as there's still other options to sort by. so the default is nothing more than a timeline, and if you want to see the "popular" thoughts you can. kinda like the latest tweets vs regular timeline on twitter.
I don't think adding a downvote would help. It's what made reddit a crazy echo chamber of the same ideas and thoughts regurgitated again and again. That's why I mentioned above that stacking sats on a post should not dictate the position of a post in the discussion and the default post sorting should be by most recent activity.