I think the UI. Described in the illustration why app or bankruptcy Continuing with additional functions

With the increase in smartphone users, the opportunity to produce smartphones content was also increased in recent years.
Smartphone screen is much smaller, whether the hassles very to accommodate the all needs of clients in this than on the PC screen.
UI will end up if you adopt every needs.
Here is a page that explains risks of such a function addition.
Referring to the giant knife of prestigious Wenger, interface psychology are described in an easy-to-understand.

Why apps collapse as you continue adding features?
http://fladdict.net/blog/2013/08/appli-toomany-function.html