Now, I can understand wanting to see haki…but is this really the time for this? Magellan might not even be an opponent that needs haki, especially in level 4. With a potential ally like Mr. 1 appearing, it seems like teamwork can just as easily take this poison man out.
It seems most people clammoring for haki feel Luffy should start using it not because the story demands it, but rather because they are impatient. Oda is building and developing a new idea that started with Duval, grew through Rayleigh, and developed further with Amazon Lily. Now it can show up anytime in the story, but it's got to be the right point. As of now, Luffy hasn't met anyone who can render his other moves useless, so until then there's no reason for haki yet.
I personally think it'll show up sometime when the war starts, assuming Luffy gets in the middle of that.
Why do you think the story doesn't require it now? We are thus far in the story and they have absolutely no clue on how to fight logia dfs. And since
sentomarou beat luffy i was waiting for a power up. If it's haki i'm cool with that. Any kind of power up that will be better than this life throwing technique…