I served on a jury recently, so I got firsthand experience in a different way.
I'd disagree with 4. We did arrive at a guilty verdict so you might take that to support your thesis here, but everyone involved seemed genuinely interested in giving the defendant a fair trial. The judge who presided over voir dire and the judge who presided over the trial were rigorous, affable, and sincere in their desires to be fair to everyone. The public defender fought well for her client. The clerks didn't insert themselves. I was really taken by the lengths that everyone went to in order to ensure that we weren't biased by certain facts. For example, it came out in cross-examination that the defendant was on probation. We wouldn't have known that otherwise.
We deliberated for hours, so the outcome was far from pre-determined.
Some other marginally relevant impressions:
1. The courts need more state funding. Your post actually makes me reconsider this, since it could increase corruption. But I think that if you had more judges and courtrooms, it could remove a bottleneck that might lead defendants and prosecutors alike to take the plea deal and move on rather than getting tied up in the courts for a long time. There are probably corrupt interests that make the current system the way it is, but I know that one reason people push plea deals is because the system would become paralyzed otherwise. More money could maybe go to public defenders as well or provide incentives to go to trial and fight hard. I have to think public defenders push towards plea deals because they have too much on their plates already.
2. Everyone should stop making "get out of jury duty" jokes, and jury duty should be more heavily incentivized. It's a lot harder to get a trial by your peers if you're lower on the socioeconomic ladder, because people are trying to get out of jury duty since they can't lose the money from work or perhaps even the job itself (that's illegal de jure, but de facto? Who knows). I'm not sure I'd want my jury to only be there for the money, but there's always gonna be a risk that your jury has bad motives.
3. People watch too many crime dramas. This isn't as relevant to what you're saying, except that it might actually be a counterpoint to your argument. Jurors can be unwilling to convict because the guy didn't confess to the police, get caught on video, AND leave DNA in five spots at the crime scene. It has to be harder to get a conviction now than 30 years ago, for better or for worse.
4. It's amazing how charges can get slapped onto someone. One crime could end up having three or four different charges attached to it. I could see how that'd be scary when it's time to plea bargain, but what can you do here? How can you have a variety of charges to choose from to adequately cover justice for different kinds of crimes without using them as a club to beat guilty pleas out of people?