This makes her switch the OLED secondary for both of you you don't need to do anything fancy to set this up just login on it once you've made certain on the eshop yours is primary for both of you. Make this also her primary switch it's relatively simple to swap that about check Internet if you're unsure. Make your switch primary since that has the most games and stick to only buying games on your account. To fix it you're gonna have to fiddle with your cloud saves and pray.

Yes and that's why I said exactly how we do it. If you plan on playing Diablo 3 Seasons, then you need to be connected to the Internet anyway, so the above shouldn't be an issue. However, your wife will be able to play without needing internet, as whichever console is marked as your main console will store your licenses on the console so anyone logged in on your 'main' console can play your games.

This is because you can always play games you own regardless of who's console it is, as long as it can access the Nintendo servers to check if you own the license (it needs to check EVERY time the game starts).

The only downside is that you will always need internet access to play games you own if she doesn't also own them. She should also register your console as her main console, that way you can both access each others games for free. Yes, you can play online co-op if you own the digital version AND you register your wife's Switch as your main console.

Reddit diablo 3 on switch