Hey, I'm the one with the Schmidas touch around here, so let me be the one to kill this one off!
On the other hand, the little clicky "add thread to tracer" is a boon. There are times when I can't pop into the 'cat for whatever reason, and a couple of days is sometimes long enough for threads to wax and wane and fall off the list, but by tracing them you can always go back and catch up.
Trouble is, then you've got horrible proof that you really were the last person to post to the thread.