According to Lars Moravy, the front gigacasting and steer-by-wire were not implemented for the new Model Y due to them having trouble switching the supply chain

According to Lars Moravy, the front gigacasting and steer-by-wire were not implemented for the new Model Y due to them having trouble switching the supply chain over [1]. I guess the 800V is for the same reason. Lars said it was much easier for the Cybertruck to change to the newer systems because they expected lower sales numbers. The Model Y on the other hand has to go into mass production straight away at 3 different factories, and they wanted to keep the production process the same at all three (he talks about this at 28:50). [1]: https://youtu.be/U-h_wzxevok https://youtu.be/U-h_wzxevok