I wanna talk about DLC. I bought a physical copy of Fire Emblem Engage. I also bought the DLC. I had to go out to take someone somewhere and wait, so I brought my Switch. The game was running before I left home. Had to connect to the internet to resume the game while I was waiting for the person.
Your primary Switch shouldn't need to do that, and it also would have done it if you didn't get the DLC. It is dumb that it basically requires internet access for all your additional Switches to operate, and it actually promotes you marking your travel switch as the primary device while the actual primary device sits at home where you always have internet access.