I agree, ALL apps on the App Store should have these labels... And there's nothing that says Apple won't do the same for their own apps. But some of those "apps" you mentioned aren't available on the App Store, they come as part of the device. Do you expect Apple to put hundreds of privacy labels on an iPhone box for every feature of iOS? That would be ridiculous, instead they have a EULA and a Privacy Policy that includes all of that.
Bottom line, this is a way for iOS users to be more easily informed about privacy issues before they choose to download an app from the App Store.