Since mine just completed, and i had saved just the last few hours of dungeons/quests etc basically since i noticed it was close and wanted to check.
The Artifact power items i have gotten from dungeons/WQ/Treasures didnt scale with the artifact knowledge, unless it did, but the numbers didnt update in the inventory or chat when used?
The active world quests instantly did, as example Soldier's Splendor went from 250 to 310.
I thought even older drops scaled but i guess not?
Well, dont save yours basically