We could have IRS forms and the IRS maintaining an expansive database to cover all tax-relevant events and amounts, but that hardly seems desirable.
Federal income taxes are complex. Everyone will trip over that complexity multiple times in their lives, Federally-provided “easy file” or not.
EDIT: Just look at the qualifying criteria for the EITC, simultaneously one of the most important tax credits that many eligible low-income filers miss, and a massive source of tax fraud.
https://www.irs.gov/credits-deductions/individuals/earned-in...
How in the world does the IRS figure out automatically if you’re eligible?