Yes, most post-docs exist for the purpose of getting cheap, highly trained and specific expertise in a way that does not threaten the hierarchy of authority and

Yes, most post-docs exist for the purpose of getting cheap, highly trained and specific expertise in a way that does not threaten the hierarchy of authority and prestige. Like medical internships, they institutionalize exploitative labor practice, but are even worse, because unlike internships, where physicians at least do learn skills and the reality of how medicine is practiced, they are almost purely for the purpose of augmenting the master's portfolio of work.