I'm infuriated by the systems that are totally locked down when the car is in motion, even when the car _knows_ that there is a person in the passenger seat (it yells until I put on my seatbelt).

If I'm the passenger, I should be able to tinker with the infotainment system as I like, without restriction (especially when my dad is the driver and I want to enable bluetooth audio to play music from my phone - my dad drives a newish Outback, great car from a driving perspective, crappy from the infotainment system perspective).