Apple should ideally have supported Vulkan once it became clear that was the way the wind was blowing, and released Metal over Vulkan as a separate runtime that

Apple should ideally have supported Vulkan once it became clear that was the way the wind was blowing, and released Metal over Vulkan as a separate runtime that worked on any Vulkan card supporting their blessed feature set. It's a much nicer API, which is good for developers, and it's also in their own interests to expose a widely supported API like Vulkan if they care at all about the videogame market (which I suspect they don't): as it is, many games will just avoid Apple rather than bother to port their work to Metal, especially since Metal often has a more limited featureset than Vulkan or DX12. This would have been a best-case scenario for everyone, basically. I'm sure many people would have been very happy to use Metal on other platforms, and in exchange Apple devices would actually have support from most modern videogames. However, that ship has probably sailed now, and WebGPU is pretty much "Metal over <X>" where X = Vulkan/Dx11/Dx12/Metal/GLES/WebGL.