I mean. If a GM were to assemble a handout of important setting knowledge for the player to read, then it's expected that the player read that out of game. That's entirely true.
But this is still because it is the GM's responsibility to present the setting to players who is not familiar with it, whether through hand outs or descriptions or both. But BG3 does not have handouts. It has only what it presents in-game. Much like how movies need to establish their setting through their own narrative and can't rely on sources outside of themself if they want to tell a cohesive story, BG3 also have to rely on the game itself to convey what it wants conveyed.
