Right, this is part of what I like about the flat tax. I like the idea of Americans looking at the flat tax rate being raised and being collectively outraged.
But the flat income tax retains business taxes, including payroll taxes. The money to pay those costs are either in hidden higher prices or hidden in lower wages. That's why your position doesn't make sense to me. If you prefer to eliminate hidden taxes then why would you opt for the reform option that includes the most hidden taxes?
I can see your point, byt there's nothing about the flat tax that demands in principle that those inane taxes be kept just as there's nothing about a national sales tax that demands in principle the income tax be eliminated. Take this flat tax proposal, for instance -- it calls for the elimination of the payroll tax.