I couldn't have used a chrome book in school, didn't have the software I needed, same thing for many businesses. Can't play most games on one. Have a few hours for video/photo editing, than chrome book is for you.
I can use Google docs on a mac or a PC, same with Google drive. I don't know of anything I can do on a chrome book that I can't do on Mac or PC.
A little Chromebook is a travel PC for when you don't need to do much but look at documents or be on the web. They have a nice little niche but they also have a long way to go before they displace the functionality of other operating systems. I could see owning one as a second travel computer but I'll probably stick with my tablet.