I don't mind necros if they have useful information. Bumping a months old thread with "I like this! Thanks for sharing" or "Awesome, this was fun!" is where it gets annoying and warning worthy. Don't bump old threads unless you actually think anyone will want to read what you posted.

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what if someone has a discussion question about an old thread
why have a new one?
maybe, but let's say Valve finally fixes a bug that's been sitting around for a year
I don't think it would be unreasonable to say that it warrants a new post
even if there's already a thread on the subject