My Hyundai has a proximity ignition switch. If the battery in the device dies I can't start my car even if it is 100%. For the ultimate in reliability go for a mini-bike with a Briggs and Stratton engine.
Are you talking about the battery in the proximity key? It's a standard watch type battery available anywhere. Even if the battery dies in it, the car will start if you press the start button with the key.
The only time a NAV system/reverse camera has been problematic is when it's an aftermarket unit. The OEM stuff is usually pretty good.
Like any piece of electronics, they can and do fail. It's a given, the more electronic doodads you put into a car, the higher chance you'll have of something failing.
So are we back to the days where "imports" are better than domestic...in relation to electronics?
We never got to a point that domestics were better than imports (please don't hate me domestic lovers).