I like how you assume all these concerns away when this is the top comment and repeated multiple times. Light is visible from basically an entire dark theater. Sound, on the other hand can vary from a slightly loud neighbor to a loud guy the whole theater can hear. So, you, my loud neighbor may be disturbing me and maybe 8 others in your immediate surroundings, but I, with my cell phone distract everyone behind me, all 100 of them. You want feedback, don't just tell me I am wrong, listen to your audience. I don't want cell phones being turned on while I watch a movie for any reason.