Not sure if it's caused by power-hungry mods, the upvote/downvote dynamics or political polarisation, but you can often quickly make out specific "opinions" that are somehow magically shared by everyone posting in a particular subreddit.
The UX also actively supports this by de-emphasizing individual users and emphasizing subreddits as the primary "personalities" of the platform. This goes so far that on r/all, the names of the individual users who posted the threads aren't even shown anymore. All you see is subreddits.
That together with some "supermods" moderating large fractions of the popular subreddits and a recent post on HN of another redditor who experienced shadowbanning makes me seriously wonder how authentic the discussions you see on r/all really are.