As usual, you don't actually read or understand the information presented.
"“Automobiles have a long operating life, compared to many other consumer devices,” Thomas Coughlin, Fellow at the Institute for Electronic and Electrical Engineers, told me. “People expect their cars to last for more than 10 years, whereas many five-year-old consumer products are often considered nearly obsolete. Thus, parts for automobiles, including some chips, are often built on older, proven technology, rather than the latest available technology.”"
And...
“Qualifying a product, specifically testing activities, are costly and requires time, talent, and equipment,” Quigley said. “Some of the test equipment requirements are expensive and often not on hand at the OEM but will require an external lab, and booking time at this lab can be a long lead time activity, and is necessary for certain product certifications. Depending upon the vehicle system commonality, this testing might have to be performed on multiple vehicle platforms.
“Making changes to an existing product, changing an integrated circuit that only has the difference in the manufacturing processes would still require this sort of testing. Unless there are some compelling associated cost improvements to recoup the investment, this is not very plausible.”
Maybe your lord Elon is good with everyone upgrading their cars every 5 years, but that's not how they should be designed.