it can also happen if recruiters start thinking that their job is to make things easy for hiring managers rather than making things easy for applicants
Oh hah, I didn't even notice you were talking about job listings instead of candidates. Candidates do this too was my point. But you're 100% correct. Companies are *really* bad about this when interviewing/screening/talking to candidates.
I go out of my way to talk in general terms, but then I'll see a colleague talk in secret code. And it's like, what on earth do they think the candidate took away from that?