[1oooqooq]

with pcs you had so little variation compared to smartphones. some 5 cpus. ram was dumb. disk had a very predictable api but was the worst. serial etc was just dumb pipes and interrupts. then there was some dozen video and network cards. those two took longer to get drivers.

with smartphones you have, i can't even ballpark a number... half chips are SoC in disguise which hardware changes every week then on top of that there's a custom firmware backed for each customer. multiply that for each little piece of the device.

there's a reason Android alternatives are stuck on last released kernel version: they just copy paste the binary drivers