NA...
You are right in saying GO pays taxes incurred while working in another country however you are responsible to pay all taxes in your country of residence. The amount paid by GO will not affect, or little, taxes actually paid in most country of residence.
To top it off, taxes paid by GO on your behalf shows up on your income as a taxable benefit.
Delam..
Oz lost their non resident status option as of last month (July 1st). You'll see many Aussies looking for a job at home as the take home pay will now be the same or better here.
Yanks with deductible mortgages only benefit them if they actually have a mortgage. The downside is that the capital gain achieve with the sale of a house is taxable as oppose to Canada which is not.
As we can see taxes are so convoluted from country to country that we will never be able to bring it down to a common denominator.
As Delam said " Taxes and tax credits (if any) are between the taxpayer and the Government"
Therefore (personal opinion of course) tax should be left out of the debate all together.