I think that you are mistaken. In Qubes, none of the VMs have access to the GPU by default[0]. May you elaborate or provide some evidence to support your claim?

I think that you are mistaken. In Qubes, none of the VMs have access to the GPU by default[0]. May you elaborate or provide some evidence to support your claim? [0]: Unless you do something "exotic" like pass the GPU through to a particular VM which is not supported and explicitly not recommended for the security reasons that you are thinking about.