The fact that this is even an argument points to a consensus problem already. Medical students dont need ask about residency standards.
My take, the field is advocating for post docs and ABPP to be the gold standard. However, the field can barely sort out internship in a organized manner. There are not enough post docs around to make accreditation that important. In the mean time, licensing standards get reduced to allow practitioners to bill insurance and not have problems
Being licensed after internship and moving toward a post-doc standard would make post-doc gigs a financially viable idea.