That is not entirely true. The various versions of WebKit and the capabilities of the phones vary widely. You can't just make one version and throw in flexible

That is not entirely true. The various versions of WebKit and the capabilities of the phones vary widely. You can't just make one version and throw in flexible CSS. That doesn't even work within the iOS platform (between iPhones and iPads). These are very different, from the point of view of the user. For example, on the iPad it's easy to use multiple fingers at the same time, while on a phone, two or three fingers are the upper limit (and it's really hard to exactly hit a target then). Next to that, people also have different expectations on various platforms (like buttons being in different locations), etc. etc. My point is that you can't make one app that works great everywhere. You need to know your audience and provide really great custom-made, hand-optimized solutions. Anything that promises automatic multi-platform compatibility is an exercise in mediocrity. Who's using Java applications on their desktop? Right, nobody. It just sucks and doesn't work; and that's why platform-specific desktop apps are still alive and well. The same thing is true for mobile web apps.