It is really hard to be into this narrative. If he is forced to adapt to danger, he needs to sense the danger and be careful what's coming, not just being extreme stubborn. In this case, it just likes he know he is the chosen one by Oda and that's why he can be like this. He can tank 200 blows from Katakuri or Ragnarok from Kaido if he wants to. He can imitate future sight, aCOA, aCOC in no time if he wants to. There is no other character got this special treatment. Even Yonkos who were hype so much are gonna turn into another Piccolo. Or Zoro, who Oda cherishes so much, needs to admit defeat or accept his limits.
Replace Ace with Luffy, do you think Luffy will be kept immobilized in Impel down? If not and you foresee Luffy turning impel down into training camp getting new skill, it means you understand plot armor I mentioned.
Yeah i get it, i just mean Oda may intend for Luffy to be this adaptable boy who can to learn combat tech faster and more effective than anyone else. Its just that Oda couldn't translate it better into Luffy's behavior, so the result is depicted as plot-armor-derived powerlevel.
If Luffy replace Ace in Impel Down, yes imo Luffy will break free and learn all the strongest skills and being able to incorporate those with his own. Imitating Future Sight in a single combat is really unnecessary and too much imo, i feel the same as you.
But imo if Oda want to go down for Luffy as somehing of a genius in learning, and i feel he does, Oda should put more effort into Luffy like i try to elaborate earlier. Give Luffy the characteristics of someone who try to learn the circumstances harder than anyone else, the trait / behavior he invent himself since little.
That way, Soru is going to be justified, AdCoA and CoC punch can also be justified to some extent if Luffy gives effort to be more creative in combat than anyone else. Like Chinmi in Kungfu Boy maybe? If being creative in combat learning becomes Luffy's habit just like being hardworking in fitness and training is Zoro's habit, the powerlevel result can be justified imo.
But if Oda is not capable of putting this effort side in Luffy's learning ability - and currently he has shown that he cant do it - then Oda has been cornered into the notion of "oh well Luffy is the MC no one will be as great as him aight whaddaya expect"