This is weird compared to desktop operating systems though. Windows 11 compatibility restrictions aside, most PCs don't require that their OS be customized for

This is weird compared to desktop operating systems though. Windows 11 compatibility restrictions aside, most PCs don't require that their OS be customized for their specific hardware. At most, they need a few drivers sourced separately to be fully functional. In a sane world, I could just install AOSP on any phone without a customization step, and download drivers from the manufacturer's website if it has any weird hardware.