Because most reasonable people aren't interpreting it like this.
Shanks is 100% all about fighting/meeting Luffy. He has essentially waited until Luffy became a great pirate to move to One Piece.
Plus, read what we have so far, it suggests Shanks might not even be at Wano at all, just near it on the sea. If that's the case, then its very possible Shanks has known where Laugh Tale is all along or had all 4 RP copies without anyone knowing.
So one interpretation of this is that he was waiting for Luffy, not for an opportunity. Plus, he's not even going to One Piece yet, he's going after Bartolomeo lol.
Shanks is 100% all about fighting/meeting Luffy. He has essentially waited until Luffy became a great pirate to move to One Piece.
Plus, read what we have so far, it suggests Shanks might not even be at Wano at all, just near it on the sea. If that's the case, then its very possible Shanks has known where Laugh Tale is all along or had all 4 RP copies without anyone knowing.
So one interpretation of this is that he was waiting for Luffy, not for an opportunity. Plus, he's not even going to One Piece yet, he's going after Bartolomeo lol.
The motives for him to move now are unclear but it's striking that he explicitly aims after OP now after Kaido and BM fell a week ago.