My personal (and kinda default) take is that more forum segmentation is not the best idea at this point, with the amount of post traffic we have, unless there is a specific reason. There aren't going to be enough OP games to fill a section, and I don't think it's distracting or inappropriate to discuss them either in the Other section or the Video Games forum.
I get what you're saying but I don't really agree with the "not enough games" part if we take the Anime subforum as a reference in terms of traffic. While over many years it has amassed quite a number of threads, unlike the Manga forums there's really only a handful of topics/threads that are actually alive.
Of course one could say that on Video Game subforum many threads would be dead too because many games are old. But the upside would be that we have a place where all OP games new AND old are collected for people who may want to discuss ir ask questions. I can even give you a practical example for why this could be good.
Outside of APF the only other forum I am a member of is Playstationtrophies.org. It has plenty of sections, huge one for PS consoles that have trophy support and only minor for trophies, that don't have trophy support like early PS3 titles as well as PS1 and PS2. Yet as gamers it's not a rare occurance to play retro games and discuss them. And if someone who plays and old game for the first time, then that's the place to go to ask questions if you are stuck because gaming guides and helpful feedback changed a lot with the emergance of achievements and trophies. It's still hard to find as constructive and on point help on old/lesser popular games.
On top of that, if it's One Piece we're talking about then there's not even much traffic there because the general gaming community doesn't play those games. So if anyone would wsnt to ask a question on an old game there, you can forget to find a reply. However one would expect that on a One Piece discussion forum you could find a place to ask this.
I'm aware that this scenario, while definitely plausible, is most likely gonna happen rarely if at all. But still, as a OP forum I think we of all places should have a section dedicated to this. Because in the end, if we consider all existing games then we already have enough to fill a forum. And gaming is huge, which means even if now there's still not many new OP games are coming out, an IP like this WILL keep releasing new games. Especially the closer we come to the end of the series. Better organise it now while it's still very much easy to overview, no?
As for games? Only the very most current or upcoming OP games get talked about, 2 or 3 a year, it also doesn't warrant its own section, there's just not enough quantity for it. World Seeker, which released in 2018, is still on the front page of the other section! The second page has threads from 2014! The Musou game is the only one that has a lot of posts and that's almost entirely because it had DLC to talk about.
Think of them what you will but mobile games are also games. And they are being discussed with Treasure Cruise actually being the most active thread in the other section for years now. Other mobile games might not be as popular or big yet but they do exist and have threads.
There's just not enough of them or activity to warrant a subsection.
If that's an argument why are we keeping the archive around then? Don't get me wrong, I don't want it to go because it's nice to look up some hilarious moments of the past. But if actual activity is a factor, then it doesn't warrant to exist. And asking even one question about a current, upcoming or even retro game would be more activity than the archive has.
Also on that matter I repeat the referrence to the anime subforum. Have you actually seen the activity there? It's just a few active threads. I know there's anime only watchers but not much of an discussion about theories and speculations by anime only followers as we have it in the manga section. Yet the anime rightfully has it's own subsection. I don't think that activity should be the main metric to gauge wether it deserves it's own subsection. Sometimes having a go to place that's like some sort of encyclopedia for older topics is also a valid reason. Especially with a media like gaming, where questions about older games are not a thing out of the ordinary. It shouldn't be judged by the same metric as manga and anime, which are story driven and thus lead to talkbacks about plot. Games on the other hand are interactivity driven and while plot can also be discussed a "where do I find X?" or "how can I beat Y?" request for feedback is more the kind of activity which is different from the other two.
And also just recently a member has posted a "your ideal cast in an OP fighting game" thread. It's not about a specific game but about a dream game. That's pretty much a topic you can create in a Video Game subforum without having to talk about a specific existing game. Just like you can have all kinds of threads in the manga section that discuss things outside of one specific chapter. Who's to say that not more of such free video game topics wouldn't be created if we didn't have a dedicated Video Game subforum? I find the thought of a video game subforum being restricted to having only threads about existing games rather a narrow take on the matter.