Can you even consider Android a singular OS? I personally don't in the same way I don't consider Fedora and Ubuntu the same OS, and there's far more differences

Can you even consider Android a singular OS? I personally don't in the same way I don't consider Fedora and Ubuntu the same OS, and there's far more differences between something like HyperOS and AOSP/PixelUI as there is between Ubuntu and Fedora. Android is an app platform.