I am getting a Phantom 4 advanced this week. For years of flying with a GoPro 4 on a Phantom 2 for about 4 years, I’m having trouble understanding why I would want to ever use manual focus for video? (I can understand for still photos). With the GoPro having a fixed focus, I’ve never once felt like anything has ever looked out of focus....so I’m a little nervous to even mess with it during video on my new p4pro. Any thoughts on this?