That's exactly what I have been telling my friends for so long! They already have all of my income and expenditure details. Why don't they just fill it themselves and let me one click approve?
Actually, you'd be surprised how little of your life's information is on-hand compared to the eligibility requirements for certain tax credits and benefits. The biggest example is deduction of gambling losses. IRS knows how much you've won (receipt of Form W-2G) but unless you give it an accounting of how much you've lost it has no clue at all.