If you actually analyze the FX shots of the original trilogy you'll see huge issues. For example, the size of the stage needed to film a miniature--first shot in A New Hope they had to dolly the camera back to capture the blockade runner, but could only move it so far back, so at some point the ship stops moving forward and they just animated it by hand and you can tell the difference. Also, in the battle of Endor, there's the shot with all of the ships coming at the Falcon, except there's TIE fighters just appearing out of nowhere. Also, there's a lack of things like explosion lighting on vehicles, lack of lighting of blaster fire on other ships, lack of accurate lighting for ships moving around in general. Also for something like that, it takes a long time to do because you have to film each element separately, you hope that you match things up well.
For the chase sequence on Jakku with CGI they get accurate lighting on the Falcon that matches the environment, along with FX like dust and sparks. There's too many things that would actually be there if it were real that miniatures couldn't do. They weren't trying to match the way the miniatures move, they were trying to make it more realistic.
