I never disputed your point (though it is technicall bwrong because some phones have other app stores installed on the system partition) because as I already po

I never disputed your point (though it is technicall bwrong because some phones have other app stores installed on the system partition) because as I already pointed out, your point is irrelevant. The fact that users can install apps from other sources at all has massive benefit, as Android has already shown. There would be even more benefit if other apps could do automatic updates, but there is already benefit with what is available.