I remember when I bought a New 3DS model, I had to transfer all of my data off of my old 3DS, and wasn't able to maintain two devices at once. Has this been remedied with the Switch?

I will probably be buying a second Switch for my family this year, and I was hoping this would be a good place to ask how the family account works and if I will be able to download my titles and sign in to both Switch units with the same NNID.

https://en-americas-support.nintendo.com/app/answers/detail/a_id/22467/~/nintendo-accounts-on-nintendo-switch-%28faq%29

So it looks like digital purchases are linked to the console you originally purchased them on, unless I'm misunderstanding. This is the part that I wanted to be changed.

You can play digital games that you've purchased with your Nintendo Account on any Nintendo Switch console.

Please note that you can register one primary console per Nintendo Account. Once you've registered a primary console, your digital purchases can be played by anyone that uses the primary console. Other players will not be able to access your digital games on a non-primary console.

Once you've set your primary console, you can change the primary console whenever you'd like through your Nintendo eShop settings.

Physical games can be played on any system you like. Save data for physical and digital titles can be transferred between systems using Save Cloud Data backup (available to Nintendo Switch Online members) or the on-device transfer process.

You can play your digital games on a different console, but you'll have to set it as your primary console and you need to subscribe to Nintendo Switch Online to transfer your save data.

This means your digital games cannot be played on two or more Switch consoles concurrently. If your plan was to have two Switch consoles that can play all games all the time, you won't get that.

Nintendo's digital policy is antiquated which is why I refuse to buy digital games on the switch.

Man, I play my digital games on both my switch and in my girlfriend switch.
Still, she can play my games on her switch, since she log on my account on her switch, adding that im not playing that game online at the moment.
Totally different from 3DS and wii U.

You can log into your account on a different console, but it will be recognized as a "secondary" console for your account, meaning the games you bought can only be played by your user on this console, and it needs to connect to the internet every 4 hours or so to verify... well, I don't know what it needs to verify, but it does. Meanwhile, your primary console continues to work as always - that is, you can play games on it with any user, and while offline. You can also change which system you want to work as the primary one, though I haven't done it myself.

Right now, I'm sharing my account with a friend, and we've played Splatoon 2 together on multiple occasions despite it having only been purchased by one of us (me). We can't play if we both try to do it on the same user, but if I boot it up with another user (which I can because it's the primary console), it works perfectly fine - and thankfully, I've always used a second account anyway.

Edit: in short, don't worry about it. The 3DS sucked hard when it came to this kind of stuff, it fucked me over too. But the Switch does it fine.

The internet access is what bothers me on a secondary Switch. I have a Switch and my kids have their own, but their Switch requires online verification which is super useful during long road trips. I don't get the limitations.

It only requires it once every so often, though, you can just use data for that. I'm not sure I get the limitations either, and definitely not with how often they're required, but there are ways around it.

Certainly ways around but it shouldn't be an issue to begin with. The switch is the only console I went physical games with.