You're complaining about corruption in elected positions, and want to replace it by giving more power to the DA, or to remove the human aspect and give everything over a computer assigning mandatory minimums that only ever seem to go up.
If you have a problem with corruption, you fight the corruption. You don't consolidate power into even fewer hands, with no mercy(not that there is much of that in the first place.)
The founding fathers were a bunch of rich white dudes, that almost to a one, fail every moral standard today. Some of them would and were considered assholes in their own time. Acting like they were incredibly thoughtful/wise elder statesmen is the only Hollywood trope either one of us has brought up. Part of the protections they did try and put into place was to spread power out, and make those positions ones that elected. You know, the stuff you want to remove?
Yeah, cause there is anyone left wing on the city council and like we haven't had a succession of center right Democrats that used to be republicans as mayors.
The city is the way it is under leadership that aligns with your politics.
The city we have is the city we get if you get everything you want politically. It's literally your mess.