Matte painting may be a lost art form, as I doubt anyone was training a protege after CGI took over. IIRC, optical printers have all been retired. (ILM has theirs on display somewhere.) Motion control is still used for certain types of FX shots even today.

Let's be honest though, nobody is going back to optical printers anymore. It's too time consuming, and movies are cranked out faster then ever these days. Something as complex as the final battle scenes in ROTJ pushed the limits of how many elements you could combine into a single shot.

And there were plenty of old movies with bad matte paintings, and dodgy opticals. Watch Star Trek TMP, and count the misaligned elements in certain shots sometime.