, there's no justifiable reason why an angered Shanks would use his Kings Haki and it wouldn't even be shown affecting the Sea king, just scaring it.
There are no justifiable reasons for a lots of irrationnal behavior in OP. You need to understand that characters are human, and they do not act with pure efficiency 100% of the time, sometimes, they make judgment that are less reasonable. Shanks was characterized as a rather kind man, so there is no need for him to knock out this monster. Drop it mate. You are looking at OP characters like machines.
Rayleigh acting like a machine when he explained Haki?
No, but he could have explain it when he met Luffy at the auction house, Garp could have said something.. like I said, character in OP are humans, not machines. They do not deliver info on random occasion for no reasons but usually because it's needed for them and for others.
And again, you still can't explain why people outside of the new world don't know about Haki
Never said they didn't know about it, just that people don't go around talking about it. Like I said, you are especting characters to act like machine to deliver informations randomly. But characters in stories are not like that, they do not just deliver informations for nothing, sometimes they even have informations they do not know the value of etc.
A story is organic, powerscaling is not.
Characters in verse know about logias, monsters in the new world etc,
Not all people. Some do, some don't. It's a lived world. Again, not a world made of all knowing machines who think exactly the same way without biases or so.
the majority don't know about the power system used by globally infamous criminals like Roger, Rayleigh, White beard etc?
Yeah, and spoilers, most people probably don't know that some character can fly either through moonwalk. East blue people probably know nothing about the world outside of the journal, westblue, northblue and south blue probably just a little more, people in paradise know the basic but probably have no clue about haki, NW people probably know about haki but have no idea that more level exist etc.
There are pirates from the new world going back to the grandline and the blues(like Shanks, for example) and no one notices they have such power?
Perhaps someone noticed, but will be laughed at and ridiculized, just like Bellamy ridiculized Luffy. You need to think about the world of OP organically and in term of worldbuilding and geographical/narrative coherence. What you know, NO characters in One Piece are aware of. So when you make worldbuilding discussion without taking this into account, you will make bad analysis.
No one notices that high ranking Marines, like Garp, who visits Luffy's town frequently, use it? Why not? Is it a government coverup or something?
Why would Garp use Haki in eastblue? Again, you do not think in term of worldbuilding. Think more narratively, it will better you understanding of powerscaling.
This doesn't actually change anything. Blackbeard and Ace were talking as if they weren't familiar with the concept of Armament Haki.
No. You are inventing stuff here. The point was not about armement haki but the nature of BB's logia.
And again, being aware of Haki doesn't mean they could use it. All the strawhats are probably aware of Haki, but only Luffy, Zoro, Usopp, Sanji and Jinbe (and perhaps Nami) can use it.
A vague reference to Haki doesn't change that the system wasn't something Oda actually planned out, or else there would be no reason why Blackbeard would brag about being able to affect logias
Or he could just be cocky and show that he doesn't need to use haki to affect Logia here. Again, your explanation is bad. There are many clues for haki throughout pre-TS and narratively, it doesn't make sense to create logia (especially smoker) without creating haki to counter them effectively. You probably don't know this, but limitations and coutner power is the first thing we create in magic systems.
Ace didn't use Haki against a Logia like Smoker, when we know he has it
We know he had uncontrolled conqueror, but not the others and even then he didn't really fight smoker seriously so there was no need to use haki.
Globally infamous criminals like Sir Crocodile, who spent years in the new world, and actually like, canonically have Haki did not use it
Or it's possible that Crocodile did use haki against Luffy but was too weak to beat him. Having haki doesn't mean that you are strong, it means that you have a strong will and a way to channel it correctly. Women in amazon lily use haki still, if Luffy took them one on one at the end of east blue, they would be gone.
(outside of the sisters of course)
Are you forgetting that Luffy literally beat two Logias without Haki even being introduced?
Like I said, haki is here since chapter 1. And in skypiea mantra is haki.
Why would Oda not just have Luffy learn it if he already had a solution?
Because it makes for a better story. Luffy was lucky in both fight, but haki was not needed. It was Oda playing with the limits. Then, he introduced it when it was not possible to beat Logia user with simple luck. Which Luffy discovered with Smoker
It's pretty simple, there was no direct counter to Logia powers in the first hundred couple chapters of OP.
And yet there was. Like I said before: Smoker is a direct menace for Luffy. Luffy simply knows he can't beat him. Meaning that Oda knew already back then how he would make Luffy beat him. It's simple narration. If Oda told you everything in eastblue, OP wouldn't be that interesting.Instead, he put little clues here and there. The first being in chapter 1
And no, OPLA is not relevant to any debate about the manga, in any situation, ever. Lmfao
Then look at others evidences correctly.