The noteworthy thing for Xiaomi's car it that it supports basically every phone to work, including the next generation CarPlay with multiple windows and airplay on the center display.Sadly, this appears to be true. What Apple would have brought to the table was a comprehensive, ecosystem integrated, software approach to the car experience. But since they jettisoned all their design leads and replaced them with the COO I suppose they don’t really have the capability to do that anymore.
And Xiaomi makes phones that compete with iPhones at the same time. They could have only allowed Xiaomi phones to work with the car but they are generous and wanted to provide the best experience.