Assuming this is authoritative, could you please explain why "... even if entirely new a texture of a common rock is going to be relatively similar to an old texture of a common rock"? This is a sincere question.
Without wanting to sound like an ass, I think he means that a rock in Rivellon and a rock in the Forgotten Realms is quite similar.
Well, but that can be said for every video game, even across different game genres and different types of games. If a rock is a rock, then a rock in TOW would look exactly like a rock in PoE. Ditto Dragon Age v. Mass Effect; TES v. Fallout. Yet we don't see developers just simply copy and paste even these generic environmental objects from one of their game franchises into another. And in the case of my question, I go beyond just rocks or trees and specifically refer to such things buildings (i.e. walls, stone floors, pillars). And I don't see any rational justification for a stone pillar in BG3 to look exactly like a stone pillar in D:OS2.