When an old thread from months ago gets bumped, it will get new eyes on the material. This is fine, but it's common for people to start replying/quoting stuff that was said at the beginning of the thread (from months ago).
A lot happens from day to day and week to week, so someone getting pinged from a conversation they participated in months ago and only half remember (if at all) is awkward.
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If a player is AFK for months at a time, they can make a new thread. Or send a Direct Message. When it's a multi-page conversation, let sleeping threads lie.