

Being able to choose the OS and kernel is also important. I would not want my hypervisor machine to load GPU kernel modules, especially not on an older LTS kernel (which often don’t support the latest hardware). Passing the GPU to a VM ensures stability of the host machine, with the flexibility to choose whatever kernel I need for specific hardware. This alongside running entirely different OSes (like *BSD, Windows :(, etc) is pretty useful for some services.
To answer the question in the title: No, because these systems inherently have different architecture. Something like OpenBSD (the OS) is relatively self-contained. Linux distributions have system components that are externally developed, but a user might rely upon.
What exactly is the “problem” you have with Linux package managers? It’s specifically extra complexity to separate “system” and “packages”. This works well for *BSDs that often develop the entire OS themselves, but would pose extra challenges for Linux distributions, where the line between “OS” and “user installed package” is much more blurred.