Most bumps are for unrelated issues or don't really help much (e.g., somebody bumps a thread from 5 years ago to ask "did you try X?"). This isn't the case for all, and some threads are still relevant, but I feel old threads should auto-lock after about a year or two with no replies, with a link to open a new thread. Or maybe push auto-locks back and add a warning message to new replies to check the date and make sure their post is relevant. I've seen plenty of forums that warn a user to double-check before bumping an old thread.
I lock threads all the time because of the above issues. If the user's issue is unrelated, it's confusing for them to start posting in an old thread that's all ready populated with old posts and error messages, etc. So I'll ask them to open a new thread for their issue, and I'll lock the old thread to prevent similar occurrences. The same if somebody bumps an old thread for no reason or with a post that's really not helpful. I don't think these are bad reasons to lock a thread, and that's standard practice on many forums. I've made mistakes and locked threads when I shouldn't have, but I'll listen to feedback and re-open them.
I think BoonEx should decide on this, but I agree with Chris - in most cases, old threads should be left alone.
Thread closed. That was a joke.
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