Bedrockgames
I post in the voice of Christopher Walken
@FrogReaver
Please do not tell me what I mean.
I am specifically addressing that in the face of limited transparency when it comes to social situations and information gathering it can become damn near impossible to tell if the GM is playing with integrity. It's these areas of the fiction where illusionism finds its nesting ground. If the GM is not meaningfully constrained by fictional positioning either socially or mechanically how can we say that players have the power to enact meaningful change in the shared fiction? They can plead before the GM/DM, but a medieval peasant does not have agency over their own life because they can petition their lord to enact change for them.
Also operating in information environments means it is much easier to enact change. To shape your environment.
Because if the GM isn't engaging in illusionism, then their choices can be meaningful. It is really that simple. This is one of the reasons why it is important for the Gm to cultivate trust with players and to demonstrate. If you are running a high agency sandbox with living NPCs for example, then the players are not going to have full access to information the GM may have about those NPCs. But the GM is either honestly engaging what the PCs choose to do or not, honestly considering the PCs words and actions or not. Obviously a GM can use that lack of transparency around say NPC motivations, to indulge in illusionism, but most GMs I meet who play this way are simply not doing that.