It’s not a web app. It’s an app you install from the web.
I don’t buy the argument that native SDKs allow you to create interfaces that are inherently better, smoother, more dynamic — or more delightful — than what is possible via HTML5.
I have always thought that eventually web technologies — including accessing the device’s hardware capabilities — will replace the native SDKs completely. By standardizing cross-device development, app developers will be able to target more devices using fewer resources. I’m not saying this will happen next year, or even in five years, but it will eventually happen.