True, but just heavy and not near as portable enough.
You buy a laptop to be portable, and not to be used as your main computer. But some prefer to use it that way.
Not everyone. They buy because laptops because they want a desktop replacement. One with thernet port to a dvd rom. Just because some don't value a dvd that doesn't mean the next person doesn't. As much as I like the MBA, my MBP is still a better value and more powerful.