Yes, taking notes on paper, proofreading, quick sketches or formulas are much easier with a pen. Also exams are printed.

So why not a tablet? Infinite battery life and easy crossreferencing, e.g. just put page 2, 15 and 47 next to each other -> would need three tablets. Furthermore writing on glass still is different, even matte glass.

So while more and more parts of work are "digital", for some parts you still want "analog".