Well, the thread started slowing down a lot back around page 60 iirc. I was upset about it back then already tbh. This was exacerbated because I was not present on the discord for the majority of the year. I wanted my forum experience, damn it! As a result, I never really gave discord much of a chance after Era was settled.
The thread saw a lot of activity in the immediate aftermath of the Era settling: people were excited and energized by the shared experience, the relief of having a forum again, and just that new forum experience. The conversation that began on the GAF essentials thread greatly enlarged. We got new blood. We started new group activities, e.g. the club.
Personally, I was also playing a lot of RPG in the relevant period and even if I was posting about DQ and SMT in their respective OTs, I was also posting a good deal in here about games. Eventually, I stalled but I kept posting in here because I love this thread. So I have a lot of inane posts. I tried to at least draw out more stuff about RPGs from other posters but some of it is just babble :P.
Why do I love this thread? Because I love reading about RPGs. RPGs I have already played, am playing, might someday play, or will probably never play all. Moreover, I love the ethos of this thread, which, again, growing from its roots on GAF has prioritized inclusion and thoughtful rather than polemic critique. This should be a thread where you think about why you like and dislike things and don't take said likes and dislikes out on other posters.
I also love long posts. I like writing them. I like reading them. I think they are valuable to understanding games better. Forums are good for long posts and archival purposes.
Why do I think it slowed down? Why does conversation on a forum slow down? Lack of engagement with the hobby, lack of points of conversation, and lack of activity (yes, it snowballs imo). When people aren't playing RPGs, it is hard to keep talking about them. This thread isn't a fully open social space. We don't discuss any and everything here. When people talk about RPGs but no one can talk to them about the game they're playing and no one engages them, it can feel kind of meaningless to post. It is easiest if you can post for yourself and kind of ignore whether people are reading your stuff let alone responding to it (which they might not do if they read it, keep that in mind). At the same time though, I don't think anyone posts entirely for themselves. Moreover, part of the point of a forum is to be heard and engaged. To this further point I just raise, part of the point of a forum is also to hear and to engage. The latter is in your control, the former is not.
The other thing is Discord. Discord does provide a more general social space. It also provides a chat-friendly format. This serves some needs of the community better than this thread. It also siphons engagement with the thread away in such a way that reinforces what the majority can just chat about, namely in this case JRPG, to the detriment of what fares better in a slower paced setting, such as a forum thread, namely in this case CRPG. It closes the community somewhat, which is nice in some respects--you get to know people better--but is also obviously limiting.
So when all the JRPG conversation occurs in discord, the thread is left severely underpopulated and that also affects the CRPG conversation, which isn't occurring on discord, and was fairly healthy in this thread at one point. I think this is attributable to both the factors listed in the penultimate paragraph above and the factors listed in the ultimate paragraph above.
....
Ideally, discord would be active and so would this thread. What binds discord together, namely an admixture of personal fondness and RPG talk, is much easier to sustain than what binds this thread together, namely RPG talk.