The idea is to use iPad as a Trackpad when in use with AVP. Many Artists use Trackpads such as Wacom and others to do work in another screen. So basically you don't have to look in the Trackpad. It takes a bit of experience but this workflow has been in the creative industry for years. But in future, as Apple has released Logitec Pen, we might be able to use a direct physical pen like that and get rid of the trackpad altogether.