Re-downloading the Onebox every time the page was viewed would slow things down quite a bit. It would be silly to re-download a onebox that never changed. There’s no way to know that it’s changed, so forcing a post-rebuild (with the wrench or by editing) is the way to go. If you knew that some category was likely to have oneboxes you want to update regularly, you could create a plugin that would, say, rebake all the topics in the category on a daily basis.
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