Matter of personal preference, I guess. My take, they are both defrost functions; mirror defrost button seemed fine where it was, the rear window is in the back...why not put the button for it on the center console in the blank right next to the mirror defrost...maybe I'm the minority in this thinking, story of my life and I'm fine with that!
Just was weird how the two buttons now mounted side by side in the center console had different illuminated brightnesses...perhaps a quirk or downside of moving a button? Was wondering if anyone who had both defrost buttons on the front dash noticed the same thing?