I would guess the apps are much lighter and less buggy.

Maybe? The docs say you have to build the swift app in a weird way (meaning you can't just convert your existing code to the new framework).

Doing something non-standard hints bugs to me.

Nothing non-standard about it, and you can certainly convert existing code. But if you want to convert an app - as opposed to a framework - you should start with our template and move your code over. The Xcode app project file format is opaque, making it very hard to migrate, and we rely on it being set up in a certain way to be able to build for Android