I do know on the surface pro you can reattach the keyboard backwards to fold it away... I don't know on the surface book
Detaching the keyboard is not an issue for me. Perhaps it is for those that use tablets to present marketing materials; I don’t know.
The Surface Book that I tried out at a Microsoft Store seemed to have the keyboard firmly attached. But I guess you are right. It had a touch screen which is an incredible aid when using the keyboard, not having to rely on a touchpad.
Touch screens and keyboards seem natural with each other as the keyboard is best suited for entering info while the touchscreen is just so natural to sweep around the screen. Once you get used to it, it’s difficult to imagine it any other way.