Possibly unpopular opinion: I don't like how EPIC the musical wrapped up the threat of Poseidon in the Vengeance Saga.
Spoilers ahead, in case anyone's picked up on the musical recently but hasn't gotten through the most recent batch of songs yet
First off, Odysseus is a guile hero. He's a trickster, he wins through tactics and knowing his foe and planning and occasionally a little extra godly help. This is usually at least referenced in his various conflicts, but in Six Hundred Strike he took down a literal god in the literal god's own literal surf using, apparently, a really powerful anime style strike. Brute force.
I'll grant that maybe Rule of Cool lets this one slide, as does the trope and concept of a character being pushed past their breaking point and therefore achieving something they normally couldn't. It didn't hit me right in this particular instance but that doesn't mean it's a bad story element, you know? So okay, he takes Poseidon down with pure physical/hysterical strength in the middle of the ocean. Sure.
What really gets me is that, while using Poseidon's immortality against him does work, it doesn't feel like it should have solved the ultimate problem. I know that it's going to because the narrative demands it! Because this was meant to be the end! But it feels very hand-of-the-author to claim that this one victory will prevent Poseidon, characterized in this musical as utterly vengeful and ruthless, from ultimately winning in the long term.
If the characters acted like the people they are characterized as, if they weren't restrained by the story saying "and that's the end of that," then the most logical result of the Vengeance Saga is that Poseidon would retreat into the ocean, maybe spend some time licking his wounds, and then he'd raise the tidal waves he threatened and destroy the entirety of Ithaca, Odysseus and his family included.
The best argument I can imagine to that is that Poseidon would rather kill Odysseus with his own two hands, given how he delayed just wrecking that raft for his own satisfaction, and that he wouldn't want to get that close to Odysseus again.
But, hell. He can't go letting Odysseus walk or the world forgets he's cold, right? Don't mistake his threats for bluffs.
Somehow, with characterization like that, this doesn't feel like a satisfying (logical, sensible) end at all.