As tech advances more complex tech becomes reliable.

Think about an airbag system. There is a bomb connected to an electronics board in your car. If it goes off at the wrong time you can be hurt or even killed.

It uses a computer, electrical wiring, sensors, and so on. If say you built it with 1960s wiring it would be horrifically unreliable and killing people all the time.

Now airbags usually only kill people if they have an unusual body size or you are unlucky enough to have defective airbags.