Learning about chroma key has made me realize how many movies have transitioned to shooting on green screen to cut costs. In my opinion it takes away from the 3D realism and theatricality of film. I watched the Star Wars films with CGI removed and thought it was much better than the “remastered” versions.
Guillermo Del Toro is an amazing director who made such movies as Pan’s Labryinth and Hellboy. In his Reddit AMA (Ask Me Anything) he discussed the use of CGI and make up.