Serious dev work is not done mostly on a small screen. Your laptop is a moveable computer that will be connected to your workstation monitor. I own a 14 inch macbook and rarely use it without a display.
Laptop is nicer for coffee shops, though. Lots of things are aided by an external monitor, but not everything requires one.
The whole point of having a laptop is being able to use it on the go.
I travel by train and plane extensively and I write code on it during the trips.
14 inches is unusable.