[SoftTalker]

I don't know, what if a third mobile OS is developed and gains traction (or is just one that I prefer) but it isn't supported by the car. What if future releases of iOS or Android are incompatible with a 10-year-old version of CarPlay or Android Auto?

I'd just prefer to minimize dependencies.

[JCBird1012]

CarPlay and Android Auto were engineered from the start to be as agnostic to the car's hardware as possible. Your car's stereo is really just a dumb screen (i.e. just a display and input/output interface) with the phone doing most of the rendering + a few other things (i.e. providing some car instrumentation, like fuel remaining, if the manufacturer enables it) - the hardware requirements aren't really strict from a performance standpoint (minus CarPlay Ultra, and even then, that's just a tighter integration).