On a different subject, recently there has been a spate of new threads in various sections of the forum, started by one user (morganism), on very specific subjects, and mostly not generating much discussion or responses, if any.
I think this detracts from the forum and should be curbed. As a poster, it's often best to fit within existing more general subjects, such as "Collapse dynamics" or "South America politics" or "Medical/Health News" or whatever, rather than "Peru, Mexico, Chile, Ecuador, and the Struggle to Change a Broken System", "ECMWF modeling hiccup on high temps", "Brain Damage Caused by Even Small Amounts of Plasticizers (BPA)".
As a moderator, I often merge such threads into bigger threads, unless they have a good interest and discussion potential. If threads are not found, What's New in the Arctic/Antarctic are a good fit in the Cryo section, and general "News" threads are a good fit in the other sections. I've even gone back to past years and merged esoteric single-post threads into relevant threads to avoid clutter.
The forum has many threads going back several years which serve as a good repository of information and can be a good primer for newcomers. Some of these threads have posts only every few months, but it's still more useful IMHO than to open new threads for each new piece of news which is not in the direct subject matter of the forum (sea ice, ice sheets, AGW, sustainability and related subjects).
I also prefer to delete very old threads that just say "this thread has been moved elsewhere", this is only relevant in the first few weeks (if at all).
As for off-topic posts, my preference (not guarantee) is first and foremost to move them to other threads using the Split Topic function and then Merge Thread, or in rare cases just to split them into a totally new thread, editing a proper title (when many OT posts have been made on a similar subject). I find posters are quite unhappy with outright deletion after putting in the effort of writing said posts. Deletion I reserve for spam, denialism and ad hominem comments, or after some suitable warning when OT behavior is excessive.