Earlier quoted context omitted.
Honestly, I kind of missed Hamachi in the last decades. It was such a superb and easy to use tool to design/configure your own private networks at the time. Filesharing, local game LANs, development cooperation, heck, even media streaming was so easily done at the time. Personally I think that the future of peer to peer isn't tailscale, it's more someting along the lines of a selfhosted hamachi variant that's able to…
That sounds a lot like Headscale.
Hamachi was different because a child could use it (literally). It was designed like an instant messenger, and you could easily create groups and invite friends for a LAN party. No IP masks, no hashes, none of that complicated stuff was necessary.
I'd only see maybe a tool that was built on top of headscale that could do that, but headscale's focus is too far off for something like that, and in my opinion too low level.