I think that's where we'll have to disagree in some sense.
Adding features to the web platform will of course mean that web applications have access to more features. Some of those are great – I'm really glad we have geolocation, for example.
The trade-off is that every feature added to the platform incurs cost and complexity. Trading these off is important; what is the point in web apps that do everything native apps do, but in a somewhat less good way?
There are obviously pros and cons here, and I'm not convinced that the use cases for more complexity are beneficial enough to justify it.