We get by thus a timeskip, which completely offscreens any sort of remaining conflict (Armin convincing the Marleyan military to not instantly murder every remaining Eldian, Worm-kun going back to his home planet) but also gloss on the untold atrocities the Rumbling commited. In fact, everyone seems to live pretty happily in NotLondon, despite the event being enough to traumatize the remaining of mankind for centuries.
But more importantly, this is where Isayama's flipflopping really shines, as he desperatly tries to give bones to every side of the Trolley's Problem that was the central conflict of the final arc. The Genocide side of the rhetoric is given acknowledgement with war looming (funnily enough, this happens because of Eren's fault to begin with, what a doofus!), but thus denies them the catharsis of Eren bringing a complete finality to the conflict by finishing the Rumbling. The Peace side of the rhetoric is acknowledged as well, with Armin & the Warriors on their way to show their leaf collection to Paradis, they are denied catharsis by letting it up to the reader's imagination the thing they want to see : Armin *actually* achieving peace, not being told he will achieve peace trust me bro. Unlike in Code Geass, where the epilogue *is* the Zero Requiem unifying the world.
Some of the remaining characters suffer from metastatis, ending on either a dumb quip (Reiner's sniffag tendencies), a bittersweet spot that will prob not reach a final conclusion (Mikasa) or simply revealed they actually never mattered at all (Historia) . Levi is somehow the one who actually gets a fitting end + epilogue to his story, by far the only good part of the chapter by the way.
Overall, it's an hilarious case of fence-sitting. Isayama doesn't seem to know if he wants to please Erenfags, Eren haters, Peacefags, Genocidefags etc. he desperatly tries to have a little something for everyone, but ultimately lacks finality of an actual ending, let alone a good one.