User blog comment:Fliu/Chapter 967: The Conclusion of the Roger Pirates' Journey/@comment-24053170-20191229102243

With the release of this chapter, almost all the major secrets in the series have finally been answered.

Other then what the Treasure of One Piece actually is, who Joy Boy really is, the resting place of the missing Road Poneglyph, the actual appearance of Vegapunk, and the secret of the Void Century (which I have a feeling won't be answered till the last few chapters)...

...We pretty much know everything about the history and backstory of One Piece now.

I guess you could say that this is the most important chapter in the franchise/series outside of the ending, because everything we wanted to know is basically answered in it.