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Infotainment controls many of car systems. For example, infotainment controls car drive mode, which instantly affects gearbox. Probably requires predictable time delays for certification.

No gpl, and more importantly the gpl 'fans' who can't write a line of code but will scream about gpl violations if they can find anything - even if false.

it run qt and does everything else so it is often an easy choice.

In some cases it could also be an Android guest running as a VM on the QNX Hypervisor, where there are multiple guests (QNX, Android, Linux) making use of the same HW.

fast boot, low latency for buttons/controls.

I have a Ford Sync 2.5 system which is a cost reduced hardware downgrade from QNX based Sync 3. I'm sure the OS is doing its best while hobbled by a poor management decision but it has lots of bugs that crop up from what appears to be severe RAM shortage coupled with some gradual memory leaks. I have to reboot it regularly when traveling with Android auto. It's always a crap shoot if my phone will connect.