Ugh, I hate this argument so much. It's the argument Grover Norquist goes around making to every Republican in Congress that that (in addition to Intuit's lobbying efforts) to stop this from ever happening. (There's a great episode of Planet Money [1] about it.)
In addition to just about every major country other than the US, California already has this and it's absolutely fantastic. I've literally never heard anyone who's actually used it complain about it and say they'd rather not have the option of filing their taxes in this way.
Imagine if your cell phone bill worked like US federal taxes. They would send you a blank sheet of paper and make you write down your minutes, texts, and megabytes for the month, and any other applicable fees you might owe, calculate the total bill yourself from that, and send a check for that amount. The provider already knows what you owe and calculated it themselves; they just aren't telling you, and you're threatened with additional fines or burdensome audits if your calculations don't match theirs. This causes you weeks of anxiety and dozens of hours of lost productivity every year. (Paraphrased this argument from the subject of the Planet Money episode.)
[1] https://www.npr.org/sections/money/2017/03/22/521132960/epis...