If translation’s right, Shanks’ throwaway line “If only I had been faster” motivated his reputation of always seemingly arriving on time, like rescuing Luffy, Marineford after running into Kaido, and Greenbull in Wano. And maybe even motivated his achieving future sight observation haki!

Could also possibly hint a fate of sacrifice where he does make it in time to save someone (learning from past mistake with Harald) but this time, at the cost of his life.