I got a job by applying to an old listing, for the wrong city.

Small companies may look to fill a certain set of skill-sets, and if that is filled by one person or three doesn't matter much; can puzzle around to make the workload fit what is found. large companies may hire 10 people generically, but may stop at 5 if they don't like the candidates, or hire 16 after a good set of resumes.

Forcing companies to be overly specific in the roles is just making it harder to apply.