I've been reflecting a bit on how nature of the internet has changed, and how niche communities that I used to rely on all had specialty forums, mailing lists,

I've been reflecting a bit on how nature of the internet has changed, and how niche communities that I used to rely on all had specialty forums, mailing lists, etc, with history often stretching back years. It seems like more and more of these old-school discussion forums are disappearing, and their modern equivalents (discord? subreddits?) just don't seem to have the same feel. DPReview is probably the most recent example, but I occasionally I will still visit specialty forums like eevblog.com for EE, or VW forums for my car. It's hard to imagine finding the same sort of expertise and years-long knowledge base on current discussion platforms. Where do we go next? What happens when these communities are lost? Where are we to go if, for example, HN were to disappear?