like. even if you explain away poseidon's wrath some other way (which you can't really because half of it is anger/embarassment of the cyclops getting tricked) the nobody scene sets the PERFECT precedent for odysseus' behavior, character and his arc!!!!
it is integral to his character that odysseus is a TRICKSTER, which is the whole reason he gets his own epic. he is the antithesis to achilles, a guy who wins his battles with physical prowess, while odysseus wins with his mind. he tricks and traps his opponents until they eventually bring on their own demise. the cyclops episode is the first and clearest example of this.
the version christopher nolan apparently adapted is emily wilson's odyssey, which is the same one i have. in her foreword, she brings up the clever pun behind the nobody-line (outis/metis). i have made a post about this previously so go read that before continuing!!! this hubris is the main aspect that draws the wrath of poseidon, and like i said is integral to odysseus' character. i can imagine nolan has already heavily tuned down odysseus' hubris so i'm sure he was glad to be rid of this, beyond the fact that this pun is genuinely difficult to translate to modern language.
after the cyclops, odysseus' wit is obviously tested many more times, but never as directly as with polyphemus. the most relevant test is when he eventually does arrive in ithaca and has to walk into his own palace as a beggar. as NOBODY. THAT is the character arc odysseus faces. in the beginning he can't even bear the thought of a stupid cyclops not knowing who blinded him, in the end he has no choice but to let the suitors abuse him and his family because he can't reveal who he is. if you take away the starting point of the arc, then what's left of it?? what story are you even trying to tell?
and i understand that it is difficult to translate the pun/joke to modern language and the big screen but.... you knew that from the beginning!!! christopher nolan acknowledged with this that he can't do the odyssey justice (which is an honourable take), but at that point he should have just let the idea go. why half-ass it?? why not even try if he was so hellbent on doing it? tearing the story to shreds the way he did is SO much more disrespectful...