Nope, that's not accurate at all. The native apps support push notifications, in-app payments, native UI elements, proper lifecycle management (storing in-progress doodles across the app being killed in the background, or the device being restarted, for example), and more offline support than would be possible with the website. Among other things.

The things that are in the native wrappers are things that would be iOS-specific or Android-specific regardless of zero shared code or maximum shared code. In my case, the bulk of the app is shared -- everything that can be a common code base is a common code base.

According to GitHub's rough metrics, that's: Go 44.7% Dart 32.8% Java 7.1% JavaScript 6.9% Swift 6.6%