So long as Reddit has very specific rules regarding what is forbidden, i.e. posting personally identifiable information, then I think the subreddit system is already as close to a perfect solution as I'd want. Subreddits are opt-in and opt-out, and are moderated with VASTLY different tolerances and tastes. I tend to prefer highly controversial conversations, at the expense of pleasantness, and there are subreddits that cater to this just fine. There are others whose sensibilities do not tolerate that, and there subreddits for that too.

What I cannot stand is people demanding that subreddits be removed. I filtered out posts from t/The_Donald immediately, and yet I still see people that cannot believe that subreddit still exists. The_Donald is just a highly moderated right wing echo chamber, not unlike r/LateStageCapitalism or equivalent left wing subs. I hate, and am banned, from most of them...but I'm happy they exist for those who subscribe.