So I probably only mentioned this in manga discussions, but inspired by Yuz's desire to give more love to the mythical and potentially magical trees, this is a short and sweet theory on Adam.
From it's introduction back with Franky, we knew that the price for wood from Adam is expensive. If we assume Adam is massive, just like the Tree of Knowledge in Ohara, then quantity is not the problem. It is accessibility that creates the market price.
So now for potentially why getting even a piece of Adam wood is so difficult. Despite the action shown in the Grand Line and the New World, the Giants pirate crew led by Dorry and Brogy was the most feared in the world at the time. If the strongest Giants can move at high speeds, this keeps Dorry and Brogy relevant as New World fighters even now. Even if we take this out, very few people in the world (percentage wise at least) are able to survive going to Elbaf with pieces of Adam wood.
The anime tries to downplay it, but the manga shows branches behind the text box.
It is small, but we see white and the outline of the trunk of the tree above a relatively "small" branch in the manga panel. Since it is the land of Giants, it makes sense that the tree of Adam is also giant (relative to the tree of knowledge and Eve).
On a side tangent, on the official map
There is a GIANT island that spans the entire width of the Calm Belt on one side (bottom right corner). There is probably zero coincidence why Water 7/Enies Lobby are close to this giant island. And now we know where Elbaf is!
So the visualization makes it clear that backtracking is needed for the "Elbaf arc" to take place on Elbaf. However, I personally think the Elbaf arc revolves around the reformation of the original Giants pirate crew. We likely get more info on the rulers of Elbaf too, so all the juicy stuff will still take place. Plus, I really like the idea of Dorry and Brogy coming to Luffy's aid out of the blue which rubs it in Big Mom's face. It makes sense for both of them to have some sort of negativity towards the person that ravaged their home.
This part feels like a legit theory to me, so nice bow on top. So this is probably the main discussion point: What do you think the Elbaf arc will contain/revolve around? Will we backtrack to what looks like the physical location of Elbaf? Who will be the allies from the Giant side? Could this come after Big Mom's defeat?