My wife uses her phone in cars with built in GPS because the mfgr assumes cars can only carry one person at a time, so for "safety" they lock out GPS access unless the car is in park, even if the operator is sitting in the passenger seat. So I drive and she navigates with her phone, or her phone talks to me, or whatever.

Another thing I've noticed is take anything fast, implement it in software, and latency becomes a killer. Software is so terrifyingly slow compared to hardware. Its hard to believe that people who write disgustingly slow UIs are in the same industry as people who write anti-lock brake code or real time fuel injection code.