I started playing the Xbox One Beta, and I would definitely suggest to add the option to tone down the shadows. I don't know if it's the same for everyone, but they're harsh on the Xbox One X. I understand that they had to fiddle with the graphics to work on a console, but I have no doubt this could be a problem addressed. Also it wouldn't hurt to be able to change the size of the UI as well. ;)

Shadows are not only cast by characters but everything in the environment to the point that you don't even realize till you see it without them. If you turn them off the games visuals would take a HUGE quality hit.