[Peer]

With a recommendations system, obscure subreddits would have the opportunity/disaster of being blown up in a matter of days, which would destroy some communities. I think for some subreddits, it's better if they're spread with the word of mounth to keep their culture. It's also fairly easy to find subreddits of one's interest anyway and I also believe most active redditors already have unsubscribed to almost all of the top 100 subreddits.

[zevyoura]

To be fair, this already happens when a good, small subreddit is linked in one of the top comments on a popular post.