Which is entirely the point I was making - having anything based on GPA requires that the GPA have an agreed range, and a bunch of private universities in the US have decided to give students >4.0 GPAs - now if you see someone with a "4.5 GPA" you immediately know they're cooking the books, but a person can also have a 3.9 GPA with a bunch of bad grades countered by a few >4 grades.

My university's GPA was (IIRC) -2..9 or something where 9=A+, 8=A, 7=A-, etc but that wasn't used in any externally facing mechanism, because a GPA as a single score is not useful outside of the school administration. Single average GPAs aren't remotely robust enough to warrant any kind of external value, and they actively discourage any course experimentation because if you are wanting to do anything GPA gated you cannot risk anything that you don't already know you'll get a high grade in.