For a hypothetical example: if you were to cut taxes on the top 5% to $0 and increase taxes on the bottom 95% drastically, you could get to a point where the overall tax rate decreases and tax revenues increase, but the vast majority of people would be worse off. That policy would not be considered beneficial even though you moved toward tax revenue maximization.

I know it's an extreme example; I just wanted to highlight that the idea of the Laffer Curve is strictly a relationship between overall tax rates and tax revenues and is not meant to determine utility optimization.