So give me a partially filled out form with the information they do know then. Fill in the standard deduction, let me do the extra credit work for itemized deductions if I really want, eg I find taxes fun to do. (Some 90% of filers just go with the standard deductions.) Don't buy into Intuit's nonsense that the current system is good for anything other than their bottom line.
So the IRS calculates for each filing status, and you choose one. This would be a lot to ask years ago, but nowadays many citizen-facing government processes are web apps. Think TurboTax pre-filled with whatever has been reported.
