By comparison, the needless busywork that the IRS puts the tax payers through is nothing short of ridiculous really. It only serves to waste time and effort, and there is plain and simple no reason whatsoever why the IRS could not do it like Norwegian tax authorities does. Our system here in Norway is not perfect either, but the citizens of the United States, and the US government, would benefit hugely from a tax filing system built to help you file taxes the way that ours does for us.
The busywork comes mostly from the arcane and convoluted nature of US tax code, notably the parts that describe deductions and credits. US governments use such things as a way to implement policy, and the crap just piles up over time. Can you deduct X? How much of X can you deduct? Are you eligible for a credit? Or just part of a credit? Or none of it? etc. etc.