KitKat also combines text messaging and chats in one app, Hangouts. It's similar to what Apple does with Messages. The difference is that text and chat streams are treated as separate conversations, which can be disjointing to follow. With Apple devices, all that is managed in one stream for a more natural conversation flow.
You should expect the Kit Kat features on other Android phones when they get the operating system in the coming weeks and months.
Meanwhile, I like the clean layout on the Nexus. Icons are larger, and extra home screens aren't created unnecessarily by default. You create them as you need them by dragging an app to the right.