Comment by pizza234

I used vfio in the past, and it's not true that setups like vfio or custom kernel/virtualization "just" work. For starters, custom setups need management. There are even latest generation GPUs whose drivers are not fully VFIO compatible.

VFIO had a host of problems that are rarely mentioned, because VFIO "just" works: power management, card driver, compatibility, audio passthrough or maybe not, USB passthrough or maybe not, stuttering, and so on.