I agree with your criticisms of the justice system except that your proposed solutions haven't worked anywhere. Yes the plea practice is abusive and coercive. It has to be because otherwise suspects would exercise their right to a trial, which they can't have. Anything you do to make going to trial more attractive for defendants will result in the backlog increasing or charges getting dropped en masse.

The laws on the books today hardly get enforced. Ross Ulbricht is one of the very few people to go to prison for crypto-related crimes. You probably agree that many people involved with crypto deserve to see the inside of a courtroom, but they won't. So not only is the justice system not capable of processing the people currently in jail (despite copious plea coercion) the justice system has almost completely given up on persecuting many crimes (e.g. fraud), presumably for lack of manpower.

All countries struggle with this resource problem. We want to give everybody a fair trial but we can't. Some countries force pleas on people. Other countries rush trials. Other countries still beat confessions out of people. Different 'solutions' to the same fundamental problem. Unless fair trials get cheap there is no way out.