Point the author is trying to make is that there are certain usecases you really don't need to deliver it via app, it is cheaper and better to serve via web. For eg. The Itaki app mentioned in the article.

Of course there are use cases that you mentioned are better served via native app. For eg. Apps that need compute or location. That's not the argument author is making.

The downside of delivering everything via app is your device ends up with app sprawl that eats up the resources.