It looks like you have no glue in terms of software development requirements in the automotive industry. Software development for embedded devices is a totally different story than software development in the IT industry. The is no minimal viable product and then deliver experience with some updates. Everything has to work from day 0. Otherwise you will have a big PR disaster. Mercedes had that with its E-Class model W210. Only a few companies have exemptions from that like Tesla. A well established company like Ford, GM, Volkswagen or so who delivers something like 50.000 cars a month over all their different models requires different software quality requirements than a company like Tesla who delivers 20.000 cars a year and is considered as a Startup, which may have some hick-ups.
Another issue is, that you have even in a simple car you have at least 15 different control units and the HMI/MMI is only one of these. Throwing hardware at it means increasing prices, which you don't want as a consumer. Also remind you, that development of a car starts somewhere 3 to 5 years before you buy the car. Because the hardware has to be tested very extensively so that everything works in without problems in most worst environment like from Alaska to Mojave desert. Designing hardware with such a broad requirement is not as easy as you may think. That is the reason why automotive rated components are way more expensive than industrial rated components, not even talking about consumer rated components. The problem of what you call "decent hardware" is, that it is only consumer rated from 0°C (32°F) to 80°C (176°F) vs. automotive rated, which is -20°C (-4°F) to 125°C (257°F). Then there are also EMI requirements and much more.
The only consumer company that is close to the quality requirements of the automotive industry is Apple. But Apple has a different advantage over the automotive industry, which is they sell millions of their phone within a month vs. a carmaker sells a million of a model may be within 3 to 5 year, depending on the market level (small car vs. premium car). The iPhone within a car is only one ECU, but a car as at least 15 of them (up to 100 in the premium class, like Mercedes S class, Porsche). So the cost structure is completely different.
Another thing: Android Auto and CarPlay are no OS at all. Both are just interface definitions. Both are implemented by QNX for example. That said, QNX was one of the first suppliers who teamed up with Apple to provide an integration of the iPod.
Another issue is, that you have even in a simple car you have at least 15 different control units and the HMI/MMI is only one of these. Throwing hardware at it means increasing prices, which you don't want as a consumer. Also remind you, that development of a car starts somewhere 3 to 5 years before you buy the car. Because the hardware has to be tested very extensively so that everything works in without problems in most worst environment like from Alaska to Mojave desert. Designing hardware with such a broad requirement is not as easy as you may think. That is the reason why automotive rated components are way more expensive than industrial rated components, not even talking about consumer rated components. The problem of what you call "decent hardware" is, that it is only consumer rated from 0°C (32°F) to 80°C (176°F) vs. automotive rated, which is -20°C (-4°F) to 125°C (257°F). Then there are also EMI requirements and much more.
The only consumer company that is close to the quality requirements of the automotive industry is Apple. But Apple has a different advantage over the automotive industry, which is they sell millions of their phone within a month vs. a carmaker sells a million of a model may be within 3 to 5 year, depending on the market level (small car vs. premium car). The iPhone within a car is only one ECU, but a car as at least 15 of them (up to 100 in the premium class, like Mercedes S class, Porsche). So the cost structure is completely different.
Another thing: Android Auto and CarPlay are no OS at all. Both are just interface definitions. Both are implemented by QNX for example. That said, QNX was one of the first suppliers who teamed up with Apple to provide an integration of the iPod.