My experience is that if you resurrect a thread on accident, then usually you get 5 people steadily posting after you to complain that you posted on an old thread, lol. But I don't think it's anyone's fault when we don't notice because the site interface doesn't lock them or somehow mark them "don't post!" If it's out there people will post. I used to search threads by keyword because I didn't want to open new if it already exists, but oh whatever I stopped doing it, always open a new one now because some regularly get flustered about it... I asked before in Suggestions if old threads without posts for a long time can be auto locked, no nothing can be done about it.