UX, not UI. perfect example is you copy something on your laptop and paste it on your phone. trivial on iDevice.
https://tailscale.com/kb/1106/taildrop
look at all of that, lol. iDevice is literally copy and paste any file or text. the end - you don't even have to set it up.
Installation: Install the tailscale client
Sharing: Click on the share menu and select tailscale
It's a beta feature so there's also a switch you have to flip for now.
Installation: nothing.
Sharing: Cmd+C/Cmd+V