Well yes, for a professorship you would usually need an outstanding track record of internationally recognized research, one monograph at the very least, significant success in attracting funding, evidenced impact, experience in some senior roles in the department....
So there are qualifications, from GCSE to PhD. But if you think about job requirements, they don't just ask you for your GCSE/A level/degree results, do they?
It's as though you think at some point we'll concede ok, you're right, after you get a PhD you never had to do anything else in academia and nor indeed could you, and this unlocks every door! But that's just not the case.