I understand the importance of maintaining history, but I'm curious about what historical info is there that you think is worth saving? News about sites/trackers will be available elsewhere. We'd just be losing the Reddit-local community comments.

In my opinion, the main thing that would be useful would be bringing info over from the wiki, or stuff that should have been on it. Guides and such.

Unfortunately the info would need to be migrated manually right now. There's a decent number of posts across the fediverse right now looking for people to make a bot or script to copy content from reddit over to the fediverse. Apparently no suitable tools exist for automating it yet, and I'd imagine the Reddit API changes are just going to complicate efforts as the tool would probably need to use web scraping rather than the API.