I certainly wouldn't argue against the logic of having those tags processed separately. It seems an entirely reasonable thing to do and the option for more end-user control over how metadata is processed is always welcome.
However, given those tags were treated as genre tags in the past and that the FimFiction website displays them in the same way as it does genre tags, adding include_in_genre:genre,content would seem to be a sensible default arguing from the Principle of Least Surprise.
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