Originally Posted by: Indio32 
The obvious benefit of an app is you wouldn't need to be connected to the Internet. I know its assumed that access is all pervasive but that's not the case.
Being able to download my EYB's library into an app would definitely be a benefit but its not a deal breaker if I can't.
I speak here as someone who is not part of the EYB team. However, I spent 40 years in software development, more than half at a successful 'fruit' company you might have heard of. Having an EYB app would not magically give you offline access to all of EYB. There is a huge online database that backs up EYB -- books, notes, reviews... all of that is data... huge amounts of data, that take up space. What do you actually expect to be able to do with it offline?
So at some point you would have had to download to the app your data, what books you have, etc. Even if you could search for that recipe back home, the recipe will still actually be back home. The online recipes are still online and you are offline.
Apps backing up online services have their place. They are good when the user interface is resource heavy (lots of graphics etc) and the data stream is relatively thin (temperature, condition, etc.) Weather apps are a perfect example. A thunderstorm might require a few bits to communicate; the sexy onscreen graphic that appears with it might require many megabytes of data.
As a frequent user of Wikipedia, I see no purpose in the mobile application over the website. It's not a graphic heavy site. There are things you can do with the website (step backwards) you can't do with the application. Why does it exist? What superior functionality does it present?