In writing a job posting/ad for a tenure-track faculty position, is it better to (A) specify subfields the department is most interested in hiring in or (B) make the posting as broad as possible (even if there are some specific subfields the department prefers).
Obviously, better is subjective here. Here are some more specific subquestions. I am open to making this community wiki if it's still not specific enough.
Does (A) or (B) result in stronger candidates for the specific subfields?
Does (B) actually discourage some strong candidates from applying?
Does (A) end up producing a weaker sequence of hires in the long term?
I'm interested in this in terms of benefit to the department doing the hiring, not benefit for the candidates.
Anecdotal evidence based on substantial experience is fine. Even better is research on the subject.