"Flairing" posts doesn't do much good either, because the vast majority of users don't filter. I wonder if this actually makes things worse because the people who would downvote and present counterpoints have opted out of seeing such posts - furthering the echo chamber.
The real power of Reddit is to manipulate perception by a barrage of likeminded content, displayed over and over again to people who don't have their ideological defenses up because they're just browsing casually.
As with all things, it's on smaller community subreddits where people are allowed to think independently to some degree.
Even my hometown's subreddit (city pop less than 500K, subreddit membership less than 100k) is so heavily group-thinked that many topics of current national debate are 100% settled on the subreddit and no-go for discussion.
I was there for Javascript tricks and they insisted that I check my privilege. It got exhausting, not because it's insulting, but because the signal to noise ratio of what I came to a subreddit or mailing list to see was way off the mark.
This seems to have improved a bit in the last year or two, since Covid stole the show, but not entirely.