<p>➀ The article explores the challenge design engineers face in balancing connectivity and security, using vehicle access systems as a case study; </p><p>➁ Bluetooth Channel Sounding technology is highlighted as a potential solution for secure proximity-based systems, but faces real-world hurdles like smartphone compatibility and latency issues; </p><p>➂ Key lessons include prioritizing user-centric design, addressing security vulnerabilities early, and ensuring reliability in complex connected ecosystems.</p>