The "father of the 401k" argues that the plan was designed to shift pension risk from companies to employees, not to benefit the middle class. He highlights that while federal income tax is deferred, Social Security and Medicare taxes still apply, and most plans are limited to high-fee mutual funds. With average returns dropping to 2-4% after fees and inflation, he contends that the average $96,000 balance is insufficient for a sustainable retirement, leaving many Americans financially vulnerable.