It might surprise some people that I like the idea of fewer, broader forums, maybe even at the general level of “gear discussions”, “photographic technique”, etc.. In fact I often just look in the grand unified forum, “Show unread posts since last visit” and look for thread and post titles of interest.
On the other hand, I do much prefer threads that stay mostly on their advertised topic—or alternatively, updated post titles that inform me about their topic when that has drifted far from the OP’s title. With that mega-thread, it devolved to the point that I would see a new post announced and click through, almost always to find a post on a quite remote and to me far less interesting subject. Now there is a new Z6/Z7 thread that is (so far!) far truer to its advertising.