Ah yeah, let's just ignore:
- That Joyboy is the one who left One Piece where it is, it was not Roger's treasure
- Was responsible for the Ancient Weapons
- Left an extraordinary tale that causes the entire crew to laugh in a very cryptic way.
- Learned that Roger was too early to do anything
- Had Oden to decipher the Poneglyphs and leave a message on skypiea.
Let alone the fact that Post timeskip as a whole:
- Introduced the concept of Joyboy and his return to the mermaid princess.
- Learning hints of what the "Promised Time", which Zou and Wano have elaborated on
- Learning what Poseidon actually is.
- Sunlight tree Eve and its very likely location in Mariejois
- Learning that the final island (Lodestar) is not Laugh Tale.
- Rocks, God Valley, etc
- Learning that the Kozuki clan made the Poneglyphs, not the Ancient Kingdom.
- World Government's National Treasure
- A singular leader of the world government
- King's species and their relevance to the WG In being removed
- Not to mention the myriad of lore related events surrounding Vegapunk, the Revolutionaries, Cipher Pol, the Marines/WG and more.
You have huge, blind nostalgia goggles for Pre-timeskip. Say what you will about strawhat interactions and focus, but it does NOT deliver information better than post.