Two options: quarantine bubble failure or incubation longer than .. 15 days?
Both are possible, though the former is more likely. 5 day intervals for incubation seem too short for 100% safety. I believe omicron has some data points of longer incubation already.
Firewalls can do two things, mainly. Block inbound connections, block outbound connections. The macOS firewall is mainly intended for the former. Many folks want to prevent the latter (e.g. blocking phone home connections).
This. I factory reset my Vizio a couple months ago because it was crashing a lot and I didn’t bother giving it any Internet access this time around. There are also no other WiFi networks nearby.
Yea, it appears to address that, but the new cable doesn’t seem user replaceable/fixable and it doesn’t appear possible to extend it, as the original cable was (albeit with difficulty).
Re: if there’s something similar for macOS, it’s built-in. The new Virtualization framework in macOS 11 (Big Sur) is very very quick. User space with support for Virtio spec.