A researcher analyzes wage disparities between men and women and finds that a large portion of the gap disappears after accounting for differences in occupation, hours worked, and years of experience. The researcher concludes that personal choices, not widespread discrimination, are the primary drivers of the wage gap. From the perspective of a key critique of this analytical method, what is the most significant flaw in the researcher's conclusion?

An economist studies the wage gap between men and women. After statistically accounting for differences in education level, specific job roles, and years of continuous work experience, the economist finds that the wage gap is reduced from 20% to 5%. They conclude that direct workplace discrimination only accounts for this remaining 5% gap. What is the most significant logical weakness in this conclusion, based on common critiques of this analytical approach?