To be precise, the subforums I'd like to see archived are the following:
- Everything in the "Transport Tycoon" section, except "Screenshots, Scenarios and Saved Games", which should be moved to the OpenTTD section
- The entire "TTDPatch" section, as TTPatch has been pretty much entirely superseded by OpenTTD anyway, and when people post in that section, it's usually by mistake
- The entire "Transport Empire" section, as that project has not been active for around a decade
- Most of the "Other Projects and Games" section. "Simutrans" and "Railroad Tycoon" can stay, they're both actual finished games and have fan bases (although I'm pretty sure Simutrans have their own forum and the subforum here is a wasteland). All other games in this section seem to never have released anything playable and are, at least in my estimation, unlikely to ever do so.
For the other subforums I've listed, well, they're ghost towns anyway. P1SIM, at least, seems to still be in active development, or at least the author has tweeted some screenshots in the last 12 months, so I can see why some people might want to keep the forum anyway. But in the case of "Transport Empire", you can't tell me that this project is still going in any meaningful way. There's of course room for discussion on where the line between an active project and a dead project should be drawn, but I think it is clear that this line exists and at least some of the "Other Projects and Games" section is quite clearly over that line.