As you note many devices now have mechanisms that let you enter the password from a phone or computer where it should be possible to copy/paste from a password

As you note many devices now have mechanisms that let you enter the password from a phone or computer where it should be possible to copy/paste from a password manager. But that usually requires some sort of two way communication between your computer or phone and the device you are setting up or requires that the device has a network connection to a server that your phone or computer can also connect to. You may still need to manually enter the password for that network connection. Many WiFi streaming TV boxes are like that if I recall correctly. Manual setup to give them network access, but then later when setting up apps on them for Disney+, Netflix, and the like the apps can use an authentication protocol that doesn't need manual password entry. I make my WiFi password easy to type for that reason.