

As I understand it, MacOS’s desktop relies on GPU instructions that haven’t been implemented in any non-MacOS hosted virtualization environment. So you can have a MacOS VM running on a MacOS host just fine, but you can’t run a MacOS VM in a Linux host, even on official Mac hardware, at least if you want the actual desktop environment. The Asahi Linux people have mentioned it before.
Thread is a bit more power efficient, which matters for battery powered devices that aren’t connected to permanent power and don’t need to transmit significant data, like door locks, temperature/humidity sensors, things like that. A full wifi networking chip would consume a lot more power for an always-on device.