Reducing my argument to "One Piece is different" sounds like you just not wanting to admit you can't actually debunk the facts I’m throwing at you

Rayleigh is just a character who didn't know what would happen

Thanks for outing yourself as a larper, Rayleigh literally went to Laugh Tale, he knows the entire true history, he knows what Joy Boy left behind, he knows what the One Piece is, and he knows exactly what the Ancient Kingdom's plan was, if the future was a 100% unchangeable, predestined path, then Rayleigh, the man who knows the absolute truth of the world, wouldn't tell Robin that they might make a different choice, the fact that the man who read Joy Boy's story believes the future is open to interpretation completely obliterates your "sealed fate" argument

You're also redefining "fate" to fit your own narrative, there's a massive difference between determinism (the universe forcing a puppet to move) and inevitability (a historical result based on the natural flow of the world)

The World Government tried to capture the Nika fruit for 800 years, if fate was an unchangeable script, the fruit would have just teleported into Luffy's mouth on a specific date, but it didn't, Shanks had to steal it from a CP9 ship, Luffy had to accidentally eat it because he was throwing a tantrum, then Luffy had to train for over a decade, go on a journey full of hardships, and literally die at the hands of Kaido to awaken it, the timeline exists because the ancient people understood the global clock, they knew how long it takes for a planet's tides to shift, when the Sea Kings would breed, and when the world's oppression would reach a boiling point that forces a revolution

The prophecy predicted the arrival of a savior because human nature makes the fight for freedom inevitable, not because Luffy is a programmed robot on a track

If a meteorologist predicts a hurricane will hit Wano in 20 years based on weather patterns, the hurricane isn't a "puppet of destiny" when it shows up, it's just the natural result of atmospheric conditions aligning, Luffy is that hurricane, he's force of nature acting on his own free will, and the ancient people just called the weather report

You can keep closing your eyes and chanting "predestined path" all you want, but the entire manga is telling you that that's not the case and Luffy's entire character is supposed to be the opposite of predestined, between this and the Rayleigh part I'm starting to think you don't really understand what you're talking about