Data from standardized testing shows average IQ scores around 85 for African Americans and 100 for White Americans in the US, a gap of roughly 1 standard deviation that has persisted with some narrowing. General intelligence is one of the strongest predictors of individual educational success, occupational performance, income, and inversely correlates with criminal involvement.
Widespread acceptance would likely end blank-slate explanations for group outcome gaps and encourage focus on the actual mix of genetic, cultural, family, and environmental influences. Policies could then prioritize individual assessment, family stability, and effective interventions over group-based redistribution.
Group averages never define any person. Variation within populations far exceeds differences between them, and every individual must be evaluated on their own abilities, choices, and character.