The simplest solution right now is if you suspect necromancy just flag the post, type in the something else box “necro”. A mod will take care of it sooner or later.
Sure it won’t prevent anything but it will stop users from continuing dead conversations
If resurrecting threads really bugs people, we NEED to get rid of Suggested Topics. Even if you get in the habit of checking the activity date every bloody time you glance at the thing, all it takes is a interesting topic that one time you forget to check and you will accidentally resurrect a really old thread.
Either it needs to filter out old threads, or be removed entirely.