Transparency would certainly help but it cant solve everything. But medical care isn't regular and predicable, so at best you can get better transparency about the routine costs.

My car was recently hit in the parking lot. The body shop said, here's the cost of the repair of the items we can see, but with the warning that it could go higher if we open things up, and find additional damage. Same with people.

The other thing is the you know with a car exactly what you will end up with in the end. And with simpler medical procedures that is true, but as they get more complex - the more you are navigating a mess of interlocking procedures, probabilities, and outcomes.