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departure4885on Sony's Mark Cerny Has Worked on "Big Chunks of RDNA 5" with AMD

Because if they write their own they get to own the political/bureaucratic portion of the problem. For better or worse, they don't have to deal with the Kronos Group. They get to optimize their APIs directly against their research with AMD.

departure4885on Sony's Mark Cerny Has Worked on "Big Chunks of RDNA 5" with AMD

Why would they? They have their own (two actually) proprietary graphics APIs: GNM and GNMX.