For as long as you talk about digital side, you can. Your smartphone is a way more noisy electrical environment than your car.
A smart phone is not a "way more noisy" environment than a car. It has different issues, and frankly a far more constrained and predictable environment. A load dump event in a car can take the 12V supply over 100V. I have never heard of that in cell phone. Long wiring harnesses are a nightmare and require careful design. It is hard to compare a cell phone and car without a clear definition of "noisy", but as someone who has designed systems similar to both, I think the car is a harder set of problems. Just not as constrained noise sources or components.
Cellphones are are certainly tricky, but in a different way than cars. In my experience with EMF measurement and EMI compliance at Underwriters Labs, cars are uniquely challenging due to the relatively strong EMF generation from the huge number of motors, solenoids, coils other magnetic bits banging around and interacting with each other in hard-to-predict ways.
When a failure can kill someone, you have to take it much more seriously than when a failure slightly inconveniences a user while they restart the app.