I2C is also a bus, just one that's less reliable and involves more custom work to use. A "virtualized OBD-II" is really just a UDS server if I understand what

I2C is also a bus, just one that's less reliable and involves more custom work to use. A "virtualized OBD-II" is really just a UDS server if I understand what you're trying to convey. UDS is a dumpster fire of a protocol that should be expunged from existence, but my personal feelings aside can be run anywhere you want. That exists. I'm not aware of many systems that directly connect the infotainment processors directly to critical CAN buses. Usually there's an intermediary component to isolate them.