But then the base model with only one clock would need a clock that reads the can bus, and something putting the time on the CAN bus. Instead they just put a cheap ass standalone clock in the base model. And this clock trickles up to the models with more features.
IIRC at least one of the two other displays optionally take turn-by-turn remote guidances from the nav. So it can easily have a time data type added to that data, and they didn't. Though, all I researched for was for an outdated model of a car, and it seems one of three desynched clocks appear to be not be present anymore, and the desynced clock count must have gone down by one, unless they compensated for the loss by adding one.
No? Presumably the one base-model clock would be the canonical clock writing its idea of the time to the bus. No need to read it, and no need for a hidden clock anywhere.