Devil's advocate: or is it employers that need interview coaching? If a candidate otherwise suited for the job (with necessary training, skills, aptitude, etc)

Devil's advocate: or is it employers that need interview coaching? If a candidate otherwise suited for the job (with necessary training, skills, aptitude, etc) is rejected on the basis of an interview, I would suggest it's a problem with the interview. Unless, of course, there aren't enough jobs for qualified candidates, which is a different problem altogether and interview-training some candidates will only result in an arms-escalation without any benefit on the macro scale.