I'm not sure of what issue you have with my statement. For me, it is a painless download + sh NVIDIA-....run. I have mostly newer GPUs, though the 3 systems (1 laptop and 2 desktops) with older GTX 750ti and GT 560m run the nouveau driver (as Nvidia dropped support for those).
Its a 13 year old laptop, and still running strong (linux though). Desktops are Sandy Bridge based. The RTX2060 and RTX3060 are doing fine with the current drivers. I usually only update when CUDA changes.
But yeah, its pretty simple. I can't speak to non-linux OSes generally, though my experiences with windows driver updates have always been fraught with danger.
My zen2 laptop has an inbuilt Renior iGPU, and I use it with the NVidia dGPU also built (GTX 1660ti). I leverage the Linux Mint OSes packaging system there for the GPU switcher. I run the AMD on the laptop panel and the NVidia on the external display. Outside of weirdness with kernel 5.13, I've not had any problems with this setup.
