87.6% of Americans took the standard deduction in 2019 and 87.3% in 2020. There's zero reason why all their tax filings could not be fully automated.

That's a great point.

A simpler system can “solve” a problem, but it often disregards complexity instead of handling it.

A federal sales tax is such an example. It simplifies the calculation of tax burden (solves the problem) by implementing a regressive tax code and placing an undue burden on lower income residents.

Tax deductions for single employed people, married couples and married couples with children, without capital gains, are stupid simple and also cover the majority of the population.