I wonder if Apple would ever make StandBy possible without having to be plugged in to power. It's a pretty cool feature but it's seems as if it's a good way to run the battery down if you have to have it connected to power to use it. But I guess it will never happen as Apple doesn't trust us with power related issues (just like no option to turn off the ambient light sensor on Apple Watch). I for one would like to see this one day.
