If things have changed, I think it makes sense to ensure the FAQ is updated to reflect the latest information. The primary purpose of the FAQ is to accurately inform people of what the game is like now.
Oh I completely, fully, and 100% agree with that. Precisely because the FAQ is an FAQ. But it's not the destination I disagree with, it's how it's reached.
As RagnarokCzD mentionned, Larian could have kept a note of what changed. Or even just struck out the out-of-date information.
