The time remaining indicator was really useful. It was more than accurate enough. It allowed me to see at a glance if I had enough charge to finish the movie, if it would last for the rest of the train ride, etc. If I saw that the battery wouldn't last as long as I had expected, closing Slack would fix it. The problem with the time remaining indicator was that people started reporting the displayed time as actual run…
I myself bought a brand-new 2015 model 15 inch, and I'm getting all day battery close to 12 hours. I've never had a laptop deliver such battery life before. And that's doing C++ development all day!