KitKat has both Ks capital.
TouchWiz does have quick toggles - tap this:
There are many, many devices that do not have an action bar - not just Galaxy S4s. Older Sony phones, HTC phones before the new One, all Samsungs, most Chinese Android phones, and others.
The app drawer icon isn't always in the center - in TouchWiz it is on the right, and I like mine on the left.
Other than all that, the article is awesome for beginners. Will be reading this and sending it to a couple of people.