No, they don’t. The chipmaker is a big part of that.
Yes, you DO need sophisticated chips. My rather simple '14 Mustang has 17 different computers on the comm bus. All but one, the radio, are required to run the car. Actually, the radio rings warning beeps and bells so it is still important. And they are seperated but each communicates and shares data.
Keep in mind, chips run on machine level code. Each chip has different coding requirements. Linux is an operating system, like Windows, and is not used, as I understand it. Mostly because it takes up a lot of space and slows things down.
This was explained patiently to my mechanical engineer self by my brilliant systems engineer employee…so I may have a few details wrong!