When the changes went through I nuked all my comments and then my account. I don't know if many others did the same, but if so it would mean that you wouldn't see our "I'm leaving" comments anymore, i.e. that we wouldn't be included in your samples.
>>837204+(OP)
Yeah, reading old threads is weird. The majority of everything is intact, but there's enough deleted or mangled comments that it is an effective minor inconvenience.