It's more than just a work/personal split. Even at work, having "development" and "production" tailnets so that things like testing complex ACLs, inhouse apps that use tailscale via its API, etc. are possible without having everyone on the devops team create an unmanaged/non-company email so they can create their own development tailnet, and then deploy a bunch of company IP using this rogue account.
That sounds extremely risky. Apart from the fact that it makes it much harder to restrict access for leaving employees, mixing personal and work identities sounds like a recipe for disaster. What happens if a personal account gets banned? How do you enforce security rules?
I guess companies where there's not even any identity management, securing your network via tailscale is not your primary concern.
It's a pain point.