Here's a real-world example of the choices the administrators and moderators are up against. I use the terms "administrator" and "moderator" loosely because I'm not really informed on titles and division of duties.
It's 2008 September 23. There's an
APOD of dwarf planet Haumea and its two satellites. At this time, there are three separate threads running about this APOD:
1. "Eggs in Orbit (20080923)" - about technical/astronomical issues (4 posts)
2. "Wrong picture ..." - about the selection of the "big" image (3 posts)
3. "Haumea" - about the grammar in the APOD description (4 posts)
On one hand, these threads have nothing to do with each other, and so they
should not be combined.
On the other hand, three short threads is a lot for one APOD, and so they
should be combined.
Due to fortuitous timing of the posts (so far), there would be only one post out of topical sequence if the posts were combined at this time.
Since I can't make a clear choice what I would like to see happen with these threads, I have to say that anything a moderator does or does not do is fine with me.
However, it would be nice for me when looking through the list of topics in the future if all the threads had in their titles (a) the date, (b) the APOD subject, and (c) the thread subject. Items (a) and (b) would identify the APOD and would identify all three threads as being about that APOD. Item (c) would differentiate among the three different thread topics.