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The real wtf is: if the IRS already knew what you owed why did you have to go through the rigamarole to begin with?

Lobbyists. Intuit (creator of TurboTax) among other organizations tells Congress that if the IRS does it for us, it's stealing jobs.

not all taxable income is reported to the IRS

No, but the vast majority is. Which means for the vast majority of people the IRS could easily send you your taxes already filled out.