Let’s say you’re just going to reset an old Mac and re-install the OS, or setting up a new one. And you have at least 5 other logged in functioning Apple Devices close by.

Why can’t I use them to authenticate and transfer the wifi code by scanning some QR code or whatever?

I get that it has some security implications, and I’m fine with confirming it in a safe way. But I just want to not manually type my long as fuck Apple ID password multiple times. Or my wifi code.