Egghead has been the least Luffy centric arc and has been all about the world of one piece. And it’s been one of the best new world arcs to date.
I agree with first half and disagree with last half.
Yes Egghead is not that much focused on Luffy specially because we are often going outside of it. We are seeing Kid, Law, Sabo, Vivi, Garp etc. And inside Egghead we have Vegapunk's plot, Stussy, Bonney... Besides Vegapunk wanking Luffy's G5 I don't think it has much about him.
But not sure if this is one of the best arcs of new world. Better than Wano and WCI for sure. I still have Zou, Dressrosa and Return of Sabaody above Egghead. Not sure about Punk Hazard, Fishman Island and Reverie.