To be fair, American exceptionalism has little to do with the glories of our IRS.
Our tax code is also absurdly complicated- https://www.businessinsider.com/2014-how-many-pages-in-the-u... as an example. As I've said elsewhere, some of the most significant opposition to the IRS pre-filing taxes is trusting that it operates in good faith - or at least competently - and appropriate applies all deductions that a person is eligible for. Simplifying the tax code would go a long, long way to alleviating most people's concerns, I think.
And many people will still go to a private tax service to verify that everything that could be accounted for is accounted for. The concern isn't that people wouldn't be able to make changes, the concern is that people would naively accept whatever they are told they should get back, even if that isn't the case.
To be fair though, I think this is somewhat less of an issue after President Trump's tax reforms; with the doubling of the standard deduction, it's become less fruitful for most people to attempt to itemize their deductions.
Our tax code is also absurdly complicated- https://www.businessinsider.com/2014-how-many-pages-in-the-u... as an example. As I've said elsewhere, some of the most significant opposition to the IRS pre-filing taxes is trusting that it operates in good faith - or at least competently - and appropriate applies all deductions that a person is eligible for. Simplifying the tax code would go a long, long way to alleviating most people's concerns, I think.