I agree that I would have liked to have known that if my wife buzzed for a refill on her water bottle that we would be billed for the nurses time at $120/hr.
But even if I had known that, the total bill was discounted from 10k to 7k due to an agreement my insurance has with the hospital, and then my 80 | 20 kicked in and our out of pocket expense for a delivery, care and 48 hour stay was $1400 + a $300 copay. So many factors involved would have made estimating my final cost pretty difficult.
And that may be the point. It's not so much about transparency, it's more about how complicated the billing actually is.