[oliwarner]

As I said, it was slightly reductive, but does channel a sincere belief of mine: I should be able to choose the software that runs on my hardware.

That could mean anything from a source-available, non-redistributable, personal-use-only control and media system published by the manufacturer with a mechanism to allow me to upload my changes, through to an open enough system that I can just replace the whole thing. There are middle grounds (eg packages or apps) that adhere to set interfaces. You could just replace the HVAC module here.

Without that sort of control it's very easy for software systems to rot away well ahead of the hardware. We've already seen a multitude of subscription-maintenance options for mapping and entertainment. I've had enough. It's my computer running in my car, let me operate it my way.