Apple Pencil will never allow the user to have the feeling like you're writing about a True sheet of paper, instead of on a Cold display of an iPad? According to the last patent filed by the Cupertino company in June 2018 and published today by the USPTO (number 20190384402), it would seem so. Actually writing - in the classic sense of the term, with a biro or pencil - returns a very different feedback from that of a digital nib, although over time - from Samsung's first S Pen onwards - the so-called user experience has definitely improved.
So why not make Digital This Feeling writing on paper? The patent is called "Stylus with haptic feedback for texture simulation", as described in the documentation:
A pen can include a structure/housing and a tip. A force-sensitive system can record the movement of the tip relative to the structure when a force is applied to the tip. A haptic feedback system can move the tip towards the housing, for example by inducing a magnetic field through magnetic elements connected to the tip and housing. Haptic feedback can be used to return a feeling of writing to a surface to simulate drawing with the stylus. In this way, the same tip used to return input can receive haptic feedback during use. The user can continue to use the tip to write even when haptic feedback is applied on the tip itself.
A similar solution had already been patented by Apple in April of this year: in that case it was planned to apply haptic feedback (and interchangeable tips, even with brush) to tangible gestures such as tip pressure and the change of direction. The Taptic Engine, in that case, would have made his contribution to "digitally" reproduce the tactile sensation.
Today it seems that the idea has made progress, with the implementation of a solution to give the user a real "real feeling" that reduces the distance between "material" (on sheet) and digital (on-screen) feedback. Who knows, soon we may have in our hands an Apple Pencil with these features, maybe even with a small built-in display that can provide us with information, for example, about the color we are using to draw or write (patent 20190324561 published in October 2019).