I do not know that I would say that CAD operators got smarter, but when the Windows version of AutoCAD came around, you could have your "digitizer icons" on screen instead of on digitizer. The ability to "not take your eyes off the screen" is seen as a productivity enhancer and I think for the most part, that is true. Digitizers work pretty well but they idea of not purchasing and supporting another piece of equipment is another plus. Just a few thoughts.
BU