Apple take their time and make lotsa dollars - in a few more generations that will be yet another reason to update...
MS Surface Pro had a pencil (pen?) with an eraser on the end at least 5 years ago. It also had a choice of tips, one of which had some friction to make it feel like you were drawing on paper...
Guess what? It attached to the side of the Pro which had a landscape camera - from day one...
Apple are pathetic in the way they design these accessories, the very first pencil that had to stick out from the iPad to charge it was the most ridiculous design ever, followed by the dopey Magic Mouse..