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The One Thing That Vexed Me The Most About BG1...
The plot exposition is *terrible.*
Specifically, chapter 6. Your lineage is explained to you in a letter that is easily missable, and that in fact is impossible to get if you choose to kill the primary antagonists of the game at that point. Like, why could they not have just had Tethoril come to you in prison and say "Oh, hey man, Gorion left you this letter" if it wasn't already in your inventory. That seems like a really easy fix.