To use this app's (peculiar) descriptor, it is more "pleasant" for those who deal with a lot of text "information". This includes (but is not limited to) students, academics.... At the core level, it is about using many "doc files" without juggling between multiple windows, file managers, etc. Then, in addition, some may feel the (real?) need for other features. You can look at this extensive list [1] and see if you feel you are "missing" any of them, although feelings could be deceptive :)