I was searching for topics with no replies and the majority of the top results were “About the X category” pinned topics. Since the intent was to look for unanswered topics from humans, and I didn’t see an easy way to say “not the system user”, I figured “not pinned” would be the closest to what I wanted. Doing some further testing of similar searches on Meta, it appears that “about” is a stopword and my test search doesn’t show those, or any, pinned topics at the top. So my feature request is most likely not necessary upon further investigation 
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