Qualifications are hurdles. Nothing more, nothing less. If you have the qualification, you pass the hurdle. But once you have passed that hurdle, the qualification is worth nothing more.
School exams are hurdles to university exams. University exams are hurdles to graduate jobs. Once you have experience in your job, the qualification that allowed you to get that experience is no longer really worth anything.
(Of course, the study itself still has value and always will. But that's a different thing. You can pass an exam without having real understanding of the material and you can understand a subject without having an exam in it.)