The only reason people have come to this uncharitable view of the Jedi Order is because George Lucas is not a good writer. Simple as that.
Sorry to cut out most of what you said, but that would be too long.
But this final statement I have to disagree with. I feel that Lucas created the Republic Jedi Order in a very deliberate fashion. At the core they are still the same Jedi they started out as. They are still good. But they are out of balance with the galaxy. Their ability to access the force is compromised. Perhaps that explains some of the rest of it. But they have become too reliant on their rules. Something has been lost and they know it (the dialog indicates that they know something is wrong and things are out of balance). That is why Qui-gon sees Anakin as the Chosen One - a being to bring balance to the force. So we have established that there are things wrong from the outset. Qui-gon is at odd with the Jedi Council and the story makes it clear he has no intention of changing his ways. Lucas’s comments about him indicate that he is on the right path and the Jedi Council is not.
So built into the story are a number of things that show that the Jedi are not at their best in the PT.
How they handle slavery is also addressed. Qui-gon says they are not there to free slaves. Okay. If it was a timing issue, why didn’t they go back and free some of the slaves. At least Shmi. That would have been one way to help Anakin get on the right path. Qui-gon might have had he lived. The other Jedi did nothing. So it was not a timing issue. It was a policy issue. The Jedi were being politically correct for their role in the Republic.
The scene was cut, but this came up in TLJ. Rey’s third lesson was a test. Rey helped the nuns against a perceived enemy and Luke asked her what happens next time when she isn’t there. The Jedi can’t save every situation all the time. They are guardians of peace and justice. They have a political role in the Republic. This goes beyond their connect with the force. It feels like because they have a role in the Republic that they are prevented from acting in the true best interests of the galaxy. Having the added information that their numbers have fallen provides and explanation. Where once they could go out and conduct missions to help the people of the galaxy, their lower numbers have forced them into a political role where they my choose what missions will help the most people and do the most good. Slave on the rim becomes something of a non-issue because it does not fit their political role even though it fits their moral role.
The Jedi have fallen from their high point and are now struggling and sacrifices have been made. Their teaching relies on avoidance rather than learning how to resist the dark side. Their missions have become more political - controlled by the Senate and Chancellor - than moral (going to help where they are needed). The Clone Wars are the final nail in their coffin because it emphasizes everything they are trapped into doing. And they get destroyed for it.
I don’t think it is the writing, at least not this part. I think this is all pretty clear. If there is nothing wrong with the Jedi, why do they need the Chosen One to come and balance things? We are left to imagine how the Jedi would have been before all this in their glory days. But the PT does not depict their glory days, it pictures them in decline and clinging to traditions and that is included in the films.