iPads are... kids' stuff. Aside from the 8,192 levels of pressure sensitivity, the cintiq displays my 4k screen onto itself as a second screen, giving me direct pen-to-screen input. Plus the stability... also it costs about twice as much as the iPad pro.
Actually, the only thing that wasn't stolen at the Louvre's Apollo Gallery is the Regent Diamond, figure no one would take it because something to do with a curse.