Such a thing would have happened or been decided in early access or right around official release. Most people following the games development closely would have likely heard about. I still more or less remember them talking of the decision to do this - it certainly wasn’t hidden.
As for finding mention of it… good luck I suppose. Can always take a crack at using the forum search tool above.
For example, here’s an old reference but not the 80%:
Build 22 - Instanced Loot, Expanded Storage and More! (Changelog)
