I think there's a good chance that the same system/game split exists for both consoles.
I see benefits to having a reserved graphics front end because it isolates the system/app side from the game. This keeps the game from doing something that spams the GPU and causes the OS to suffer, and provides a predictable and complete performance budget for the game.
Having the system's graphics context initialized would also skip some heavier context switching and initialization of state whenever changing between the game and system partition.
In a virtualized system, having two front ends may enable less overhead in virtualization, especially since GPU virtualization is not as mature as it is for the CPUs.
I see benefits to having a reserved graphics front end because it isolates the system/app side from the game. This keeps the game from doing something that spams the GPU and causes the OS to suffer, and provides a predictable and complete performance budget for the game.
Having the system's graphics context initialized would also skip some heavier context switching and initialization of state whenever changing between the game and system partition.
In a virtualized system, having two front ends may enable less overhead in virtualization, especially since GPU virtualization is not as mature as it is for the CPUs.