I'm glad you saw it again and liked it.
I 100% agree the Canto Bight thread thematically supports the whole movie, which is really about failure. The failure of Luke, of Snoke, of Rey to convert Kylo, of Kylo to let go of the past he so desperately wants Rey to, of the Resistance and the FO in their respective aims. That's why the final scene with Broom Kid works so well; the victory is the intangible legend Luke gives the galaxy, which can never be undone with fleets, walkers, space stations or mass murder.
I will say the Canto Bight scenes needed some focus structurally. The sequence goes on too long in places, especially with the Fathiers. I personally would have sent Poe/Finn together. I think there would have been more conflict for Poe to discover the action he likes a little too much is all a product of a moneyed elite that has no allegiance except to profit. I don't know what Rose learns, in her story. She remains dedicated to the Resistance, and to justice, from start to finish. She opens Finn's eyes about things, sure, but there's no tension there. Poe wanting to run back to the Resistance and fight and Finn wanting to run away to Rey works better.