What is left to charge? My laptop lasts a really long time. I could never need to charge it even daily. My iPad can last days as well. My iphone 6 easily lasts through even my longest day. Charging these devices is easy and done during down time. I still need to sleep for hours every day. I can get my charging done then. It is a minor inconvenience. Though it is a daily issue still.
My older devices aren't so energy efficient. But I'm going to replace them in fairly short order.
If they can make this device and get it to work, that would be a game changer. But lots of my charging issues are falling away. Though I suspect I might soon have another charging device in the form of an Apple Watch. So that might be another issue for me. Oh well.
What is left to charge? There can never be enough charge. I can very heavily drain my late-2014 MacBook in just a few hours, and prior to that when I used my iPhone 6 as my primary device it would only last because I could charge it while driving to and fro. I even carry a constantly charged battery pack in my car for those days where I have to step away from my normal outlets.