The only contrivance I could do without is keyless ignition, which provides an effective attack vector for thieves and the ability to lose the keys while driving.

A mobile phone in works well to augment the aging infotainment / satnav, the only issue being UK law is unclear on whether it's allowable to touch a phone in a cradle. The police say you cannot touch your phone when driving and lawyers say you are only banned from using a handheld device, which a phone in a cradle is not.