You are thinking more character based and less the very entity that the WG represents.
- They ARE the global force of control in the series.
- They ARE directly responsible for the mystery around key figures and objects in said story.
I think the thing youll have to wait for is the Void Century, since that seems to be synonymous with Imu and the WG's flashback at this point. As for ehat they represent, remember in a way, they are directly responsible for:
- Robin's capture
- Ace's death
- Now Cobra's death
- Fishmen freedom
Etc.
At this point, it may be better to see what their weapon gets used for next. It quite literally is a world ending/cataclysmic scenario too, since the sea level rises everytime it is used.
As I said:
Until he attacked Sabo, Imu and the Gorosei have been more of an abstract threat.
Sure, they have done everything you have noted, but Luffy hasn't had that much direct interaction with them. And this
is Luffy's story... compare to say D.Gray Man where Millenium Earl interacts with the main character directly from the get-go.
Right now, I'd place the Gorosei more into position of Sauron in Lord of the Rings: yes, they are the global force in the control of the evil and are directly responsible for most of the evils in the story...
BUT they have not personally carried out any of these evils, and their threat has so far been abstract with them working more through their agents. Therefore, there is no need for the main character to face them directly - take out their support structure, and they may collapse anyway. Or they may be fought in the closing chapter, after a climax of the story.
But yes, we will likely need to wait until revelations about the void century.
You’re thinking too personally. Luffy rarely gives a shit about personal revenge. If he did he would be hunting Blackbeard, but he’s not. He’s merely trying to become the pirate king.
When he was fighting Kaido he did it because Kaido took the freedom of the people of wano. When he fought Doffy it was because Doffy stole the lives of those in Dressrosa, and so forth.
Luffy fights people because they’re actively doing the one thing he hates, robbing others of their freedom. Imu is the exact opposite of that freedom. The world government beats down and enslaves people every day. They rob islands until they’re too poor to even survive. That’s the ultimate enemy for Luffy. A man who has taken the freedom from countless people throughout the world.
Luffy doesn’t have to be personally invested in Imu, Imu and Luffy are diametrically different in their values already, and those are the fights oda writes.
Yes and no.
Literally every enemy Luffy has fought, he has fought them because he was
personally invested in taking them down. It is just that Luffy is a very empathetic person (especially when it comes to food) and will easily get involved into other people's problems and will do everything he can in order to help them.
If Luffy really was the way you describe him, he would be joining forces with Dragon. But he isn't: he generally doesn't think long term, and will not go after the World Government until they affect him. Whether that is him in person, or one of his friends, or just a random stranger he meets, doesn't matter: Gorosei will still have to do something to make Luffy go after them.
Of course, this might still happen.