The Chosen One thing is something is wish George never explicitly answered.
He said Anakin was the Chosen One, and if you only look at Lucas’s films that makes sense.
It’s more just a PT thing, I find. I guess it does work in all movies if killing the Emperor was all he needed to do, it could work. However, the OT never really says much about old Anakin beyond “good pilot,” “good friend,” and “good at being a warrior.” He’s decidedly not a chosen one there.
The concept may not appear in the OT, but it’s not a contradiction either. Obi-Wan once believed that Anakin was the Chosen One. By the time of the OT, he no longer believes that. Why would he mention that he once did?
If one views Luke or Rey as the extension of Anakin’s deeds, then he could still be a proper chosen one.
In what way is Rey an extension of Anakin’s deeds? For that matter how is Luke an extension of Anakin’s deeds, unless you mean the deed of f*cking Padme?
Also, nothing about the prophecy says that balance had to be permanent.
Is it even temporary? Anakin’s act of personal redemption changes very little as far as anyone else is concerned. Sidious is still alive. The Sith plan is still in motion. The de-Sidioused Empire is on its way out, but the First Order will take its place, and the Exegol fleet will be ready by the time the First Order falls. In the big picture, what has Anakin actually accomplished?
What did we accomplish in WWI and the Treaty of Versailles when 20 years later we had WWII? Art imitating life.
And it is quite clear that Palpatine wasn’t really back. He was knocked out of power and for an unknow period of time, was had no influence on the Galaxy. Even if the transfer was immediate (I do not think so myself), his political power was lost and his hold on the Dark Side of the Force was broken. Anakin restored the balance of the force, regardless of what Palpatine and his Sith disciples were up to. It took 30 years for him to claw his way back and even then he did not have the power he once did. Some readings of the ST make it sound like nothing had changed when it is quite clear that everything had changed and they were fighting to prevent Palpatine from gaining power again. It took Palpatine more than 13 years of manipulation and trickery to become Emperor the first time and the events of the PT take place over just a year and there is no way he could undo the past 30 years of freedom in that short of time. Nor could the First Order.
In the ST, the First Order, Kylo Ren, and Palpatine are a scary monster trying to topple a 30 year old Republic from the outside. In the PT, you have a skilled political manipulator working from within an 1000 year old corrupted republic and he is able to use the system to gain and keep the power he craved. He cannot get that back in any easy way in the PT. Not possible. His plan is victory by intimidation (put me back in power or I will destroy your worlds) and Rey stops him before that plan can even start. So the ST is not a rehash of the OT. The situation is totally different and the stakes are different.
Palpatine died and Anakin balanced the Force. That was true in ROTJ and it remains true in TROS. Palpatine came back and Rey destroys Palpatine utterly and balances the Force again. I found this to be a very fitting thing to happen since Lucas’s inspiration for Star Wars was Flash Gordon and Ming kept coming back when you thought he was dead. Palpatine coming back once is a nice tribute to that origin and made a great story.
Losing control of the Empire was a minor inconvenience for Sidious, and it had more to do with the rebels blowing up the Death Star than with Anakin throwing Sidious down that shaft, which ultimately accomplished nothing. Sidious could have shown up and controlled what was left of the Empire, but the Empire had been sufficiently weakened that the First Order and secret control were the better way to go.