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Isn't this all because PCI resizable BAR is not required to run any GPU besides Intel Arc? As in, maybe it's mostly down to Microsoft/Intel mandating reBAR in UEFI so we can start using stuff like bindless textures without thousands of support tickets and negative reviews.

I think this puts a floor on supported hardware though, like Nvidia 30xx and Radeon 5xxx. And of course motherboard support is a crapshoot until 2020 or so.

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This is not really directly about resizable BAR. you could do mostly the same api without it. Resizable bar simplifies it a little bit because you skip manual transfer operations, but its not completely required as you can write things to a cpu-writeable buffer and then begin your frame with a transfer command.

Bindless textures never needed any kind of resizable BAR, you have been able to use them since early 2010s on opengl through an extension. Buffer pointers also have never needed it.

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