Working in the office is not working on the go. Working on the go is finish up stuff and send it before boarding a plane, or work on that same plane, or during your train commute.
If you're going from home to the office and back, I don't see the point in carrying anything other than your smartphone. Talking about the general case, obviously, there are justifications for bringing a medium-sized laptop.
I get things done in all those cases on the setup I mentioned. Obviously if you're taking 8-hour flights then you need that much battery, but is that a common case?
It's a very common case that you have a hard time finding a socket in some places. It happens a lot to me that many others are working on their laptops and all sockets are taken, or even that there are no sockets at all in some trains.
