The issue with reddit is that your experience on it is completely dependent on your own curation of what subreddits you want to take part in. For hobbies I don't think there is any other single website on the internet that can help you get through most beginner to intermediate information, it's curated by a community, usually with the best free resources available being shared, and if it's a small community with decent moderation they usually thrive quite well.

The problem is with the large subreddits, they will always devolve into memefests or the same old rehearsed jokes in the comments where if you've been on reddit for 10 years you learned to just... Skip through.

I believe it'd be really hard to have a /r/AskHistorians on 4chan, the same for the hobby communities I'm part of.