Earlier quoted context omitted.
Correct, the built-in drivers only cover the "Kepler" architecture, as that was the last one that Apple used in a Mac. The 3rd party Nvidia drivers which support more modern GPUs are only offered up to macOS 10.13 High Sierra. The technical background for this is that Metal and OpenGL acceleration requires the GPU driver bundle to be loaded into a process's address space. (effectively a dynamic library) With 10.14, A…
Someone on reddit suspect apple’s stance against Nvidia in this driver signing carnage is because they are not happy with Nvidia about cards in MacBook Pro
One of their highest priorities at the moment appears to be to remove any 3rd party code running in the context of Apple processes. For examples, you don't need to look far: kext -> DriverKit/System Extension transition, hardened runtime, etc. The Nvidia driver breaking is just a consequence of that increasing lockdown. The simplest solution would be to allow nvidia's code to run in the context of core system and user processes again (kernel, WindowServer, just about any GUI app) which presumably is not palatable to them or they wouldn't have made the change in the first place. The alternative would be to farm this type of driver out into a sandboxed user process. (Nowadays this means DriverKit.) Aside from potential performance issues, this would be a lot of work, so it's probably never going to happen unless literally millions of end users start complaining.