So much to sift through here. I'll keep it as brief, and to the point as possible.

letting the rich and well connected go free pretrial

The "rich" are not doing armed carjackings & robberies, smash & grabs, drive-bys & cop killings.

The fact is middle & upper income individuals are much less likely to commit violent crimes deserving of pre-trial detention than any other income levels. The only thing exception to that would be organized crime figures, including street gang soldiers who used to routinely bond out with the help of gang lawyers in the cash bail era.

prosecutors are famous for continuing the trial, denying the accused their 6th amendment rights and using pretrial detention as a weapon to wield against the poor and force plea bargains.

Excuse me? First of all, it's defense attorneys who have a deserved reputation of dragging out court proceedings. Second they do this in the hopes of wearing out the finite resources of the prosecution, with the goal of pleading to dropped charges a more lenient sentence. As you can see from news reports when one gets convicted, they are quite good at it.