Craig Hockenberry, for A List Apart:
With such great tools available and talented developers that know how to exploit them, the iPhone should be overflowing with web applications, right? Actually, the opposite is true: there are over 100,000 titles on iTunes and only a handful of popular applications have been created with web standards.
Apple has promoted both the App Store and web browser as ways for developers to get their creations into the hands of customers. They even gave the web a year-long head start before beginning to sell apps in the store. Clearly there’s more at play here: what attracts developers to iTunes instead of the web?
He goes on to list control, ease-of-use and money as the top reasons developers go native.