Psychologically, withholding also makes the tax burden invisible except around April 15, thus helping government grow bigger.
But therefore ending it would diminish the power of politicians to buy votes. So it will never happen.
It’s the Earned Income Tax Credit “refunds” they are alluding to.
Free Taxpayer money for people who don’t pay Income Taxes, People who work under the table and Illegal Invaders raising their Anchor Babies.