There are some subs that I'd rather see dead, and some that are just amazing, just based on their moderation and communities. r/fantasy is a shining beacon of light in an otherwise dark world, and with it a lot of the sister communities like WoT, Stormlight_archive and similar. They all have a positive feel, including and fair with just enough moderation without becoming heavy handed.

So in a sense it's not so much the content, but rather the community itself that I'd love to see persisting beyond reddit.