Phil Tippett is a fairly well known—and well regarded—stop motion artist and visual effects supervisor—whose big break happened when he was hired by George Lucas in 1975 to create the special effects for the stop-motion holographic chess game (“Dejarik”) seen in the Millennium Falcon in Star Wars (1977).
His work with Lucasfilm and ILM (Industrial Light and Magic) continued with his use of stop motion animation to bring the Tauntauns and AT-AT walkers to life in The Empire Strikes Back (1980) as well as creating the Rancor beast and animating parts of the speeder bike chase on Endor for Return of the Jedi (1983).
Knowing this, how did he feel about the primarily CGI-based visual changes, additions, modifications and tweaks George Lucas made to the original trilogy of Star Wars films in 1997?