While you're probably right technically speaking laptops compete heavily on battery life. I wouldn't be surprised at all if (like mobile devices) they're at the

While you're probably right technically speaking laptops compete heavily on battery life. I wouldn't be surprised at all if (like mobile devices) they're at the point of optimizing relatively minuscule points of power draw. Like most things once you start looking at dozens of factors that are 0.5% wins each you end up with a substantial improvement that in the case of battery powered productivity devices is significant from a sales standpoint.