What? The kid doesn't learn how to add 15% for the tip as well? And is that 15% calculated with or without the sales tax? And do they learn what professions do get tipped and what not?
This used to be the case in Belgium till, I think he 1950-ies or the like.
And about not including taxes:
To me it is strange that people say it is hard for companies to do this, while their cash machines can do the calculation, so it is somehow possible. Also often it is said that it is hard because of the different taxes in different places. That means you are looking to companies that are in multiple places, like those that operate in e.g. Europe where there are different tax systems in the different countries with different currencies and yet here the same companies are somehow able to do it.
It makes it a LOT easier to compare prices if the taxes are included. In Europe we even introduced new money to make comparing prices much easier (The exchange prices where already fixed for a few years). But then the EU is much more customer driven and the US is much more company driven.
And about tipping and the quality of service: I did not notice any difference in the quality of service in Europe or the US. There where cultural difference as there are in Europe, but all in all the service was at the same level in comparable places.