in reply to Q re nodes' subjects
I think that part of the reason for some of the recommendations concerning retitling are due to the way Newest Nodes works. The basic issue is that as NN doesnt track thread information a note posted with a totally new title gets "lost" in the clutter of the other notes posted. Oddly I think the opposite occurs in Recently Active Threads where a retitled note tends to stand out as it doesnt look like the other nodes in the thread. But Recently Active Threads is fairly new so the sitedocs probably predate it.
Providing your title has good keywords and possibly some reference to the old title (even implicit) then I personally see no reason against it. Avoiding one word titles, and meaningless titles is a good idea however, and I personally think its annoying when people remove or mess with the RE: count on the node.