I agree with you. When evidences are indisputable, the criminals should get a minimum mandatory sentence, and the judge can only decide to "add" more time depending on the details and repeated offences.
I thought it was already setup like this. Not to give entire power to judges. But to jury to decide guilty or not guilty. If guilty. Mandatory with extra depending. wtf is this new shit. When did it come into play? Or has it always been like that. I don’t know. Gotta research. But I have a feeling the bottom of that rabbit hole will be large nosed small hat involved.