So I wasn't actually let down at the lack of new stuff to do exclusive to the new semester, because a) I viewed it as more time to get the existing stuff done and b) P5R does add new activities (like the Darts/Pool games, the temple, the jazz club), they're just accessible earlier on, rather than being locked exclusively to the last 30 days, which I honestly feel is better. But I do get why there may have been an initial "aww that's a bummer" response there haha.
Now, Akechi. I agree with you almost word for word on this. I was not a fan of Akechi at all in the base game, I love what they do with him in Royal. Part of this is that his new Social Link helps immensely in fleshing him out as a character (where in vanilla, the social link functions more for plot progression than as characterization), but mostly it's because of how he is handled in the Royal semester. He's basically a full on edgelord, a total psychopath, and it's fucking hilarious. The game makes no bones about it, it even pokes fun at it itself. I love edgelord Akechi, and I especially love that, yes, there was no attempt made to redeem him. He's still a person who made many bad choices, and there are no excuses made for that. His partnership with the PTs is also handled in a way that it doesn't feel contrived, which was the one thing I was worried about the most before I played Royal.
Kasumi... so I hated the Kasumi twist initially. It's just so bizarre and so outlandish, you know? On this playthrough, I was able to swallow it a bit better (presumably because of the jarring dissonance coming from my "wtf" reaction is now out of the way so I can deal with it for what it is), but I have to be honest, I am still not hugely sold on it. Like I get the whole personal dissociation thing they are going for, it is just handled in the most anime way possible (even for Persona), and feels like a rare miss to me where almost everything else the game does is so great.
Maruki, however, fucking hell, he's incredible. All time great villain, even calling him a villain feels wrong. Because here's the thing, it's actually not clear he is wrong. He's created a world where everyone can be happy, and no one suffers. You are actively fighting against this. And, like, I am aware, academically, that it is right to go against him in this case, because as you point out, the whole theme of Persona 5 is to take charge of your own life and take back your future. The bulk of P5 deals with it by pitting you against evil actors who want to take away your agency to further their interests. Maruki takes away your agency to further your happiness, and there's a very strong case to be made that there is nothing wrong with that. After all, look at the state of the world right now - would giving up the ability to "choose for yourself" be the worst thing if homelessness, poverty, slavery, racism, war, famine, disease, all this came to an end? The world would be a better, happier place, right? And that's the genius of Maruki, because he's not a villain, not in the traditional sense. He is actually right from a utilitarian point of view, and even when you ultimately take him down, there's this sense that you are giving up something in order to retain that agency and control. It's not a clean win. There's a case to be made you chose wrongly (the game itself actually sort of hints at this, the ending when you choose to accept Maruki's reality is far better produced than the ending where you reject him).
I just love the entire Maruki arc so much, because he's not evil. He's not even wrong. He's trying to minimize pain and suffering. You are actively going against that. The deftness with which this entire arc is handled is astonishing, and truly makes Maruki/The Royal arc some of the greatest writing and storytelling I have ever seen in a video game. Like, if this is the caliber of writing we can expect from this series going forward, under the stewardship of the new developers now that Hashino, Soejima, and Meguro have moved on, then the series is in amazing hands.
Amazing game, truly amazing, and honestly just the Royal arc is worth $60 in and of itself. The fact that it comes on top of a 100 hour epic that's already pitch perfect is just icing on the cake.
Also, the moment in Royal when I Believe first plays is still probably the single greatest moment in series' history (yes, that means better than P3's ending), because holy shit, what an amazing culmination, marked by the best usage of music I remember in games. What a song. What a moment. What a game.
Bravo.