I miss forums as well, and I’m actually moving back to them. Back in the early 2000’s, I visited like a dozen forums each day. I was a member of like three watch forums, a camera forum, a Star Trek forum, some gaming forums and others. Just ‘doing the rounds’ kept you busy for a while. People also were insanely knowledgeable on those niche forums, and they all had their own specific culture and flavor to them.
Places like a niche subreddit are… OK at best. They are convenient and easy to visit, but don’t tend to have the level of knowledge and discourse that I generally enjoy. You also run the risk of your sub getting ruined by people who are into the wrong aspects of your particular hobby. For example, on a watch FORUM, the discussions are about design, mechanical features, history, photography, how to repair, etc. etc. On the subreddit, a lot of posts tended to be drive-by posters who ‘found a watch and wanted to know what it’s worth’. or ‘is this fake’. The subreddit didn’t curb that, so eventually I and many others just stopped going there. It was basically too easy for people to post there just because, well, they could. Whereas on an actual watch forum, you can do a bit stricter moderation and the registration requirement weeds out low effort posting.
Some consider that ‘gatekeeping’, but I see it as a valid way of protecting one’s chosen community.