they have the advantage that they can shape the API to their needs. yes, you can argue that google apps have the same limitations as other apps. but google defines the limitations. just because google doesn't need a feature, it doesn't mean that no one else needs or should have that feature. so google is able to define features that fit their business model, and they prevent anyone else from offering a different feature set. they own the platform and compete in it. that in itself is an advantage. to not have an advantage either google must not compete with apps on the platform and or they should relinquish their ownership of the platform.
Or simply put the implementation behind a permission that they will give to themselves and practically never give to you.
I second the fighting against a copy-paste bot. It took a couple of weeks of multiple daily requests before we got to exchange emails with some sort of human being, which was almost as useless until we gave in and abandoned