[spion]

Original author here. While I agree with you on all points, I have something to add:

1) speed - while not 100% fluid, with the latest phones this year and Android 4.1, rendering speed is easily kept within reasonable FPS (>40). On Android, even native apps aren't always fluid.

4) porting - This is true, however I think you underestimate both the power of HTML5 and the easiness of using PhoneGap or interfacing between native libraries and JavaScript on most platforms. Our prototype app isn't just a CRUD app - its a presentation maker with lots of GUI that needs to access to local files/images.

(Of course, in-app purchase and platform-specific libraries mean harder to port apps)