Not sure why they are still using a 1000 year protocol when you have Ethernet as a faster alternative. Even commercial airliners uses tech based on Ethernet for their controls
Ethernet is great, don't get me wrong... but it is complex to implement in a system like a car. Each device needs to speak ethernet, be switched and likely have an IP stack. If you are lucky enough to have a built in MAC / PHY into your micro (which most don't), then you still need to put in transformers and protection circuits.
10BASE-T1S is the future IMHO, it is much simpler than traditional 10BASE-T, requires only 1 pair and can also provide power. For simple setups, only 2 resistors + 2 caps are necessary to implement and you can have multiple devices on a bus without requiring a switch.