I would say that in the beginning most apps weren’t that way- precisely because of the issues with building rich web apps. Now that it’s possible to replicate a lot of the “native” feel on the web, more apps are choosing the “wrap in a webview” approach as it vastly simplifies the development process across web and multiple mobile/desktop platforms.

Agreed on the control- another thing to consider at least in this crowd is that Safari content filters (aka ad blockers) aren’t applied in apps.