Who cares? Certainly not Oda.
He will cover whatever he wants to cover in the manga, and Shueisha will make sure to milk the rest by publishing additional stuff for decades. They have already started with Ace's novel.
Unless the stuff is extremely relevant to the plot it won't be addressed in the main story. If you expect him to give backstories to everyone you'll be disappointed.
Let's go through what he has teased in just the last 100 chapters, shall we?
- The Rocks Pirates and God Valley, as well as their elusive goal not yet defined (as to why they were on God Valley and why the WG made the island disappear)
- Kaido and BMs relationship to the Rocks pirates
- Bakkin and Weevil's relationship to the Rocks Pirates
- Vegapunk and his SSG
- Kuma, Sabo and Bonney, as well as their relationship to one another
- Shanks' ominous relationship with the Gorosei
- The Gorosei serving an absolute leader, Im.
- Vivi and Alabasta's incident with the WG
- The WG National Treasure
- Awakening in devil fruits, teased once again
- Whatever the world is flipping out about and Blackbeards goal at the moment
- The fates of each remaining ex-shichibukai and how that serves the story
- More CP-0 teases
- The Revolutionary Commanders
- One Piece, the Ancient Weapons, the Void Century, Joy Boy, Will of D, etc.
And thats just some major things since chapter 888. I go back slightly further and describe more plot points yet to be addressed by Oda. Go back further and there are a few more that are related to things he's currently talking about in the story.
To think Oda won't address these and a wealth of other plotlines just because its believed they arent "important" to the plot seems very disingenuous to Oda and his story overall. He's constantly there, reminding people that he will get to these eventually.
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The story was supposed to last 5 years, Wano was supposed to start in 2017 then it looked like Oda chose to speed up Reverie arc to make Wano happen in 2018. I don’t know, there are so many unresolved plot points that I have a hard time thinking 5 years would be enough, especially considering Oda’s old habit of miscalculating the time needed to wrap up small portions of the story. Unless he follows Kubo’s example and decides to rush absolutely everything.
Funny enough he didn't really speed up the Reverie arc, he left all of the plot points from it as mysteries to address later, so we still have to find out what happened lol.