For me, it’s a few things.
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A way to burn time that doesn’t feel like a digital sugar rush.
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Support, camaraderie, and kindness, primarily from /r/stopdrinking.
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Niche stuff, like ideas for local hiking and backpacking trips, propaganda posters, and kayaking info.
In addition to what’s been said already - the community-specific wikis and megathreads. The amount of information I could find there about sometimes very niche topics was amazing. Hopefully something similar will be possible with Lemmy.
Probably just need people or bots to copy over some posts and comments (while giving credit).