Because these are not exactly comparable. I have Thinkpad X1 Carbon which is more comparable and I'm easily getting 8+hrs of battery life. But the real benefit

Because these are not exactly comparable. I have Thinkpad X1 Carbon which is more comparable and I'm easily getting 8+hrs of battery life. But the real benefit is that it runs Linux. It's just a more productive environment for a power user. Docker uses little CPU, tools are the same as on my server, desktop environment is actually better and much more configurable. Last but not least I'm not supporting a walled garden, which is a deal breaker for me in the first place.