I didn't know that I could disagree with a rant this much.
How is the Kuvira minigame a waste of time? You get to see her massive titties bounce and if you win you see her naked. My only complaint is that the buttons should have been bound to keyboard keys like the Book 4 Slave Route Probending minigame. Because that would make it way easier to perform.
I think the prison section was a great idea. We didn't get to spend enough time with Kuvira, and now we got a whole subsection of time dedicated to her. It also set up the mystery of who the MC was talking to that whole time, was it a spirit or just Kuvira, or someone else? I'm not saying it was perfectly implemented, at times it could have been more clear but it seems intentional that a prison sequence would feel like a mindless rut.
As for the fetishes, it was already set up in Zaofu that Kuvira was a Dominatrix, that she had pubes, and that she was developing a fixation on the MC since he's the only one who could beat her. Then you see her swimsuit pics and she specifically lets her pubes grow. She likes the bush. And after all that set up, when she finally gets you alone, she's shoving her bush in your face, and doing BDSM things like cock-slapping, orgasm denial, and threatening to peg you. It was all set up.
Jinora making a mistake doesn't make her stupid. Smart people make mistakes all the time. And if you beat the Kuvira minigame then her clothes explode and she's naked in front of her whole army. It's entirely reasonable that Jinora or anyone watching would make the mistake of thinking that Kuvira being naked WAS the signal that the MC refused to give her. It's the MC's fault for not making that clear. It's also possible that Kuvira set it up. She had someone deliberately knock all her pictures down from the sky bison because she's secretly gets off on either exhibition or humiliation and it gives her an excuse to attack Zaofu even if she loses her fight with the MC.
Also if you genuinely think MITY has the time or resources to REDO Zaofu and erase the Prison section, then you need to tell me what you're smoking, and where can I find a lower dose.
Well, everyone has their own view on those topics. That's just fine.
For me for example that ominous voice was just wasted because that "woman" told the MC that Kuvira was also imprisoning members of the other nations which would actually be a game changer. However, now the MC cannot be sure anymore that this might be really true because he has to assume that it was just his imagination. It wasn't him who heard that hiss from Nagina in the end. And even then he couldn't have been sure that Nagina was just playing a mind game with him.
And then there's still the in my opinion missing interaction between the MC and Sujin except for the sexual content. There isn't that much to add in Zaofu honestly. Just some addition of talking interactions with Sujin where he also tries to talk some sense into her. That is already enough to add way more sense to that part of the story. Maybe let Sujin act as stubborn as Kuvira when the MC hits a weak spot there in a way that at least somewhat explains why she was hell bent to assassinate her own adopted daughter.
If the goal was to portray Kuvira really being evil then MITY failed to accomplish that so far. She has some weird fetishes and seems to be obsessed with the MC. But that's it so far. Right now she more or less just overstepped the mark quite a bit. She isn't that different from Azula right now. And her main goal itself isn't that bad. She just wants to pacify the crime-riddled Earth Kingdom and unite it as it was once the case. Her methods however are very questionable and she didn't take the opinions of the people actually living in the territory of the Earth Kingdom into account.
Sure, Ikki does some stupid things. But both she and Inora witnessed the MC beating the clothes off of Kuvira if you won the minigames earlier on, too. So they both should have known that the MC wasn't loosing when it happened again. And Inora until now was able to watch Ikki more or less properly.
The only weak link there could have been Opal in my opinion. Maybe she couldn't bear to watch her mother being "abused" for bukkake anymore and released the pictures out of retaliation. But this wouldn't explain the wide spreading of the pictures throughout the whole army. That would have to be done by both Inora and Ikki using airbending. And that again doesn't make much sense. Also, if it was a mistake then Inora just could have airbended the falling pictures back onto the sky bison. In my understanding she was the one in charge there. Without an explanation the decision to drop and spread the pictures doesn't make sense at the moment. If MITY really wants to go along with that he should add a proper explanation of what happened in due time. Otherwise this part just feels way off to me right now.
Also, both the MC and the Kuvira just had come to an agreement and Kuvira's words show that she felt betrayed by the MC. Her way to handle things - like being willing to fight the MC 1 on 1 without a real need from a military perspective or not attacking Zaofu right from the beginning with military force - shows that she actually has a kind of honor. And so far she seemed to be a more straight forward and not a scheming person like Long Feng (book 3 villain). She in fact despises all those corrupt politicians/leading figures in the Earth Kingdom who didn't want to do the dirty work but then wanted to reap in the benefits. In my opinion your portrayal of Kuvira doesn't go that well along with what the plot revealed so far about her.
I'll admit that there are some parts in the prison part of the story that might be required for the later parts of the plot like that attendant trying to sabotage that "super" weapon and the revelation that spirit vines are required to charge it. But so far it isn't clear what Kuvira wants to do with it. She stated several times that she only wants to unite the Earth Kingdom around its original borders. Maybe MITY just needs to improve the execution of the plot at certain points of the story to add more sense to it and everything might work out just well in the end.