Photos takes up about 65% of my iPhone storage. I have the worst mobile coverage and out of frustration, I opt to keep copies on my phone. Usually when I'm sharing my photos, I'm away from home and WiFi. It's frustrating that it's an all or nothing choice.
You would think that by now there would be more options when there's a single media type taking up more than half of most folks storage. My preference - Allow us to give a star rating (1 - 5) for our photos, then allow us to filter what we keep on the device. It would also be helpful to have a star rating just when viewing photos in general...