[bigcheesegs]

I seriously doubt it. The PS4 has a custom graphics API which directly creates command buffers in the GPUs native format. There's not really much of a graphics driver at all other than what's necessary to isolate the game from the OS.

[shmerl]

Why not though? It makes it easier for developers, instead of the need to address yet another proprietary API. Simplifying things has value.

That API was created by Sony when something like Vulkan didn't exist yet, but today there is no good reason not to support Vulkan.