Also, consider this

packagegroup.bbclass inherits allarch.bbclass - except when PACKAGE_ARCH is set before inheriting packagegroup
in order to do so, a nativesdk packagegroup must inherit nativesdk first
there is a native-last QA check which strongly suggests inheriting nativesdk last
nativesdk is inherited last via inherit_defer in nativesdk-packagegroup-sdk-host

I see all of this as either very misleading at best or a mistake at worst.