It's negotiable.Absolutely disagree.
Unless all the PCs are aliens dropped into the game world from somewhere else, they have to be created on the same chassis as NPCs - and NPCs must be created on the same chassis as PCs - or else the setting (or even the whole game) is garbage.
It's non-negotiable.
D&D hasn't had NPCs use character creation rules since 2003.
The game isn't garbage.