In my point of view, most hiring requires a form of internship. No one drops on to an established team with full knowledge and experience with the internal tools, procedures and products.

And yes, I lament that internships are so maligned. It shouldn't be that interns are poorly paid; we should be able to hire someone with decades of experience in a tangentially-related field at a competitive salary, and consider them to be interning on an unfamiliar field.