No, I wrote the post to document how an existing web app can be moved into the app store, the reasons for that, and the hurdles in doing so.
APIs: Yes, Google is improving the situation -- making more and more common OS APIs exposed to standard web interfaces. Meanwhile, Cordova is letting web devs access native functionality that the platform vendors don't expose. The story isn't perfect, but it's actually quite impressive even now.
Web apps: they offer all kinds of things native apps can't. Native apps require install. Native apps must go through approval process for every update. Native apps are restricted in what they can publish on the app store. Native apps are subject to the censorial whims of a single corporation (or government forcing that single corporation). Native apps only work on a single platform; the web works everywhere.
There are lots of wins for web apps. And I think PWAs only increase those wins.