Overcurrent protection on each pin should definitely be mandated by the standard.
But it’s important to keep in mind that Nvidia has 90% market share and can do whatever they want. If PCI standardized something Nvidia didn’t agree with, then there simply would not be any implementations of the standard, and Nvidia cards would use a non-standard connector. It’s that simple.
Overcurrent protection on each pin should definitely be mandated by the standard.
But it’s important to keep in mind that Nvidia has 90% market share and can do whatever they want. If PCI standardized something Nvidia didn’t agree with, then there simply would not be any implementations of the standard, and Nvidia cards would use a non-standard connector. It’s that simple.