[m463]

There's a lot going on there. To prevent flicker, you not only have to preserve the screen resolution, but also all the graphics card memory and state and hand it off through stages of boot from efi to the os.

As an analogy this would be sort of like rebooting the OS in place while preserving all the running apps, network state and USB connections without resetting anything.

These kinds of things are possible, but have lots of corner cases.