Most of the complaints about battery life seem to be by people who keep the screen at a certain percentage instead of keeping it at a certain brightness. eg: There are reviews where someone keeps the screen at 70% brightness instead of 200 nits. That's like a car reviewer keeping the gas pedal pressed down 70% of the way and then complaining about fuel efficiency.
Edit: Oh and if you're curious about battery life, see my comment here https://news.ycombinator.com/item?id=23106156 You should expect 5-12 hours depending on what you're doing. You could go as low as 2 hours if you stress test the CPU while at max brightness.
The biggest thing I miss from my MacBook is being able to open it after a week of being closed and still have battery. There's definitely something not going into deep sleep when I close the lid, but that's probably my fault.
The Arch wiki has lots of information on how to do this: https://wiki.archlinux.org/index.php/Power_management/Suspen...