It's not so much with USING CGI, which is obvious going to happen, it's the balancing act of using pratical sets or even locations verses overly used greenscreen. Heck all of the Clone Troopers were CGI for no reason. ALL OF THEM. Even the close-up ones and that's why they all looked weird. That's a waste of resources. And you have to consider that JJ at heart is very old school and favors pratical (when it's possible). Heck, up-close shots of Kirk and company parachutting in Star Trek was just done at the Paramont parking lot with some fans, a camera at a low angle, and a bright sunny day.