Tailscale is heavily focused on authorization (authz; what you can do), and considers strict identity verification (authn) crucial to that goal. So they chose t

Tailscale is heavily focused on authorization (authz; what you can do), and considers strict identity verification (authn) crucial to that goal. So they chose to delegate the latter problem to a party that's already solved it better than Tailscale could. This is reasonable and I'm with them. But I do agree with you on your point; once you lose your Google account, you lose a lot more - including your personal TS network, which may include offsite devices, grandparents' PC, etc. Unfortunately your TS account is also heavily tied to the chosen ID provider, I don't think you can change it at all (even if you go thru support). I would prefer to be able to link two IDs to a single TS account (e.g. Google and Apple), perhaps be able unlink the one I don't want anymore. I see a security concern in there (you either have a weak link, or you can't unlink an account you don't control anymore), but it would still be nice.