If your taxes are simple enough to fall under the 1040-ez as most Americans are, the IRS does know your exact tax responsibility. I have personally received a letter from the IRS informing me that I'd filed wrong, and gave me the actual correct values. Many Americans have.
Just because you personally disagree with something doesn't mean that it's a ridiculous lie.
There used to be, they got rid of it around a decade ago. I think I remember the reasoning was the 1040 was simplified at the same time.
Edit: Yep, 2017 was the last year the 1040ez was around, and the regular 1040 went from 74 lines that year to 18 the following year. The 1040ez for 2017 was 12 lines.
Just because you personally disagree with something doesn't mean that it's a ridiculous lie.