Not quite understanding you here. Care to explain?The problem is that stage manager tries to split the middle and ends up doing neither well. Most of the people I know (aforementioned kids included) don't really multitask on their iPads beyond split view or a floating screen. In fact, they usually just use their iPhones as second screens when needed.
I think when people look at their phones as references instead of using SplitView sometimes ends up being they forgot the feature existed. Because they are so accustomed to using the iPad as an iPad, one app at a time... especially if they don't know any better.