If you are a professional and spend 10 hours a day at your computers, you will realize the quality of the screen matters a lot.
As seen developer with 1080p at 14" inch I cannot stand the ugly fonts you get.
It's not just about real estate. Just out side by side a 1440p/retina screen next to a 1080p and you will see the difference.
It's ok if you value battery, good for you. But saying there is no advantage is ridiculous.
