I had a lot of years thinking multi-seat was the coolest & wanting to see it everywhere. Still think it's rad and obvious, but it's not clear how it'd fit into my life, what it would be for. This is cool to see & a great use.

Did something similar a different way.

Multiple video cards and usb pci cards — one of each passed through to different (UEFI) VMs using libvirt.

Actually worked really well. Was nice to run Linux and Windows with a “native” feeling user experience on each.

At least cheap Radeon cards worked fine. Had one higher end card whose windows driver silently refused to work until I masked the hypervisor bit in CPUID.

Was nice to “manage” it from a separate monitor/keyboard while still having benefits of shared storage. Could quickly reset a VM to a snapshot. Out-of-band backups were similarly convenient.

Otherwise more financially practical to have multiple cheap PCs, albeit with harder to manage storage.