Sure. Just like I trust race car drivers to drive even though they don't know how to fix the car. As long as they understand the basics of how the car parts interact, they'll be just fine driving it.
On the other hand typical Uber driver does not need to know anything about the car other than what pedals are for and you turn the wheel to steer. If he tries to take the car to the limit, he probably gets 1 star rating from scared passenger. No need to know how car works.
You decide whether Google engineers are more like race car drivers or Uber drivers.
It'd be a bit like 'someone else has set up a software development environment for you, now write some code' I suppose.