There is a hardware limit, just like there is with Touch-ID. I don't really see the point in continuing with this if you're going to argue in bad faith - trivial research would have revealed that and other limitations which would prevent this on the current line-up.

Now I'm not saying that Apple can't produce an iPad in the future that delivers on the right experience mix in a multi-user capable setting, but that's not what you're asking for - I've provided just a few of the mant kinds of limitations that will degrade the user experience in a way that makes clear that Apple aren't just trying to juice their customers.

So the answer here is neither "Apple should just make it happen", nor "You should just buy a second iPad" - the answer is: you should buy the tablet that gives you everything you want, or learn how to share, I rdgaf.