Underrepresented minorities are as a whole not as optimized for the system. Some of that is that cottage industry of essay writers etc, SAT prep courses, etc... but some of it is objectively not being as prepared. Now some of this is also due to growing up in worse environments for academic performance but this is a real difference in performance.
I have interviewed Stanford students. There is a step difference between the Asian/white students and the underrepresented minority students in their performance. The underrepresented minorities were still smart but the Asian/white students behaved like they were a year or two ahead in school.
And the median?
[1] https://www.taxpolicycenter.org/fiscal-fact/median-value-wea...
1.5x is a huge difference in income. Imagine a 50% raise.
I do think it makes sense that the wealth difference stems from blacks having so little time to build wealth. The income also is a big factor for sure, but it’s hard to see it causing the 10x gap by itself. OTOH generational wealth is lost really quickly.
You may respond that a lot of these benefits are about wealth, not race. However the two are connected. Black Americans on average have a tenth of the wealth of a white family.