Why isn’t the amount allocated for each student income qualified?

According to the Wall Street Journal, the upper 20% of wage earners currently pay 88% (as of 2019) of all income tax collected. Other estimates are as high as 91%. That means the higher wage earners already pay nearly all of the funding for K-12 education. This wealth re-distribution system is already highly progressive. The majority of the upper 20% wage earners do not have children in K-12 education and would be drawing no financial benefit. Putting all K-12 California students on equal financial footing is extremely fair.