Earlier quoted context omitted.
True, and another key component, which will become even more important once median incomes are taken into account, is public services. For instance Paris is described to be about as expansive as San Francisco. But in Paris, you have your kids' school and your health insurance for free (well, included into your taxes). Plus, if you studied there, you don't have a student loan to pay back.
Well, including that wouldn't make sense unless they also included taxes.
Or simply give salaries net of taxes. In many countries, a large chunk of the taxes are paid by enterprises, and never appear on your salary sheets, although they're part of your compensation package (they're paid by your employer, because he has to in order to legally hire your workforce, and they serve to fund services you'll benefit from).