Tight coupling to binary blobs and proprietary HALs + vendor specific OS changes etc make maintenance a chore - everyone in the chain has to be on board for it

Tight coupling to binary blobs and proprietary HALs + vendor specific OS changes etc make maintenance a chore - everyone in the chain has to be on board for it to happen. They are incentized not to, new phones means profit for carriers and new hardware means profit for chip makers. Maintaining old products costs money, not maintaining products saves money, planned obsolescence prints money