I think this plays right into other employment issues. There is a feeling that employers will not train you. Many STEM based employers that need highly trained individuals (DoD, Pharma, data-science, etc) are outsourcing some of that training to PhD programs. Thus far, the situation has been acceptable in STEMy fields. But the PhD program is not structured to train the high skills workforce (it just happens to be okayish at doing so) and that mis-match is coming to a head.