In the wave of "Software-Defined Vehicle" (SDV), the design thinking of automotive HMIs is undergoing a fundamental paradigm shift. It is no longer merely a "human-machine interface" controlling vehicle functions, but has transformed into a "smart mobile space" integrating life, work, and entertainment. This means that design must transcend traditional instruments and central controls, considering how to seamlessly integrate the digital ecosystem into the cockpit to achieve a continuous experience across devices. When the car becomes a sustainably updated and personalized subscription platform, the success or failure of HMI design will directly determine a brand's core competitiveness and user loyalty.