Desktops and laptops are commodity hardware with standardized drivers and interfaces. Phones are secretive buggy hardware running secretive buggy binary blobs.

Desktops and laptops are commodity hardware with standardized drivers and interfaces. Phones are secretive buggy hardware running secretive buggy binary blobs. It's difficult to get manufacturers to upstream anything or even give you any information at all about their hardware, and it's a herculean task to work around all the firmware oddities to upgrade devices yourself.