Some tablet owners prefer using a physical keyboard, while others are perfectly happy tapping virtual keys. Certainly, there are times when a keyboard just gets in the way. Example: You're sitting in coach at 35,000 feet and plan to watch a movie. Sadly, your clamshell ultrabook is simply too large for the meal tray. Or perhaps it won't fit on the tray because the clueless jerk in front of you has reclined his seat all the way back until it brushes your nose.
The vast majority of today's ultrabooks are skinny laptops with permanently affixed keyboards. Granted, the rapidly changing mobile landscape is blurring the boundaries between tablet and laptop. Microsoft's Surface 8 Pro, for instance, is considered a tablet. But given its ability to run Windows 8 desktop apps like Adobe Photoshop, it could be classified as a touchscreen laptop with a detached keyboard.