If it's hype, it's not hype the way you're thinking. I've shown Tailscale to a lot of people (this is less salient now, when pretty much everybody uses Tailscale) and the most common reaction I've gotten is "holy shit". It is spooky simple to get working, and it's spooky simple to go from a working installation to a VPN configuration that would take many many hours to replicate with pre-existing tools.

There may be VPN nerds out there who think there's nothing special happening with Tailscale, but I submit those nerds haven't spent a lot of time dealing with the median, replacement-level VPN configuration prior to Tailscale. I'm a pentester, and so I have had that pleasure. Tailscale is revolutionary compared to what it replaced.

And ease of use, IMHO. That's a bit one with these kind of things. I will admit not having used tinc but I imagine it's not as polished.

Polish costs effort and money and it also really truly saves time and makes for a better product. So that matters.