[nradov]

Forcing all taxes to be itemized separately is a win for enabling people to have the most information to make the most accurate decisions. It allows them to see how much money the government is taking from them, and depending on whether they think that number should be higher or lower, allows them to make informed voting decisions. Voting is far more important than choosing which restaurant to eat at.

[eiopa]

Why does that mean that the final price must the opaque during the moment of purchasing decision, though?

If the goal is keeping people informed, one can show various breakdowns, piecharts or any other creative infographic at the canvas of the bill.