Honestly I think you're overestimating most people.
The concept of a LAN is a non-starter for many folks. My measure are my in-laws. They like technology but don't understand it. My mother in law does not know what LAN means or how to access it.
These things phone home for the apps that lets normal people like that run them.
Your inlaws can presumably print from their phone, using MDNS to find local printers, and sending the traffic direct to the printer. They can presumably also do airplay operating in exactly the same way.
They don't need to know terms like LAN or MDNS or Bonjour or whatever.
The concept of a LAN is a non-starter for many folks. My measure are my in-laws. They like technology but don't understand it. My mother in law does not know what LAN means or how to access it.
These things phone home for the apps that lets normal people like that run them.