Just like LibGCM is limited to Sony and GX is limited to Nintendo.

Yes, so what does it mean? As I said above, Vulkan is the only non lock-in option.

You keep on attacking MS alone as if they weren't actually following what are game industry practices.

Not MS alone, but anyone who uses lock-in. And why should such despicable behavior be respected, because it's an "industry practice"? It is not. It's just common because various major companies in the industry are indeed jerks.