Then the prosecution brings case law where a person of color in a similar situation got a very different sentence, or someone without the rich parents etc.

I’m sure there’ll be biases but minimum sentences won’t undo those. I’d find minimum and maximum sentences very unfair for situations like described by the person you replied to. Case law and perhaps a blinding system (Justice is blindfolded after all) where at least one of the judges involved doesn’t get to learn things like “white guy with rich parents” might be a better solution if that’s the problem this is intended to solve