Hope this help someone, its just my opinion I'm a professional cinematographer & stills photographer, and no to control depth of field is not the main reason, OK to put it in simple terms,
We as camera persons have been asking forever for cameras that produce great picture in low light, fast lenses & fast sensors so now the cameras are able to shoot in light so low that years ago it would just be a black noisey screen the result of this is that when you take these cameras outside into bright sunlight there is way too much light getting in the camera for it work correctly, All high end video cameras have built in ND wheels with at least 3 ND filters to choose from.
OK you move from a controlled set to outdoors, daylight the first thing you do is apply ND filters to the point that the f-stop you are using outside is exactly the same as you were using indoors or the look of the images would be completely different & not match. Just 2 points, car wheels spin backwards everything is so sharp its unnatural & jarring.
You would NEVER wind the shutter up on a professional camera or shoot to adjust the exposure, as someone mention earlier you would be kicked of the set never to work again. There is a sweet spot for the lens & the sensor to work if the the camera does not have built in ND filter you must put one on the lens. The shutter speed should be double the frame rate, usually the best setting for the lens is not wide open or shut down completely its in the middle f-stop. if you get both of these right most of the problems like jello or flat washed out images will never appear. Of course there are time you want super sharp (stopped down) or shallow depth of field (wide open) these are option you can choose to suite the style your after.
Anyway this is what I have learnt from many years in the industry & it always produces constantly great images, this is just the exposure side there is so much more to photography than the technical means of achieving correctly exposed images and once you get this right you can really start to enjoy the art.