I can't find it right now but there was a post announcing the port to tvOS on their blog where a developer from the UK (but living in the US) talked about how it let him buy, configure, and ship a simple consumer box that uses little power and needs minimal hands-on maintenance to his parents' house as a replacement for a server he had been running in their house as a VPN endpoint for this sort of thing - so he could watch BBC, etc.
I wouldn't want to update a RPi that's in someone else's house on the other side of the ocean.
While I still prefer running a plain Wireguard VPN if possible (i.e. when there's a publicly reachable UDP port), the really big advantage of Tailscale over other solutions is that it has great NAT traversal, so it's possible to run a routing node behind all kinds of nasty topologies (CG-NAT, double NAT, restrictive firewalls etc.)
At worst, I turn on phone hotspot, authenticate, then switch back to WiFi. A purely serendipitous discovery on my part, but a very welcome one.