On the other hand, a new comment is more likely to be seen if it's in the current open thread. I'm not sure whether keeping a conversation in one place is more important.
Maybe a very specific conversation (such as giving a specific person advice) should be kept in one place, whereas a conversation of more general interest is inevitably going to be discussed repeatedly in different threads.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.