This is the same author for the 2 games, Eric Fenstermaker.
And I think you’re in a very bad position to call a writer incompetent, given that in my opinion you didn’t even understand Eder’s writing.In the first game, Eder is lost, he doesn’t know what to do and is even ready to let himself die. Why? Simply because he no longer has any reference: his brother and Eothas were the two important figures for him, but these two figures disappeared and acted in an incomprehensible way for Eder. Eder is someone who needs a guide and that’s what the Watcher will become for him in the first game. Because the farmer is not someone who aspires to greatness but he will participate in great acts by following our character.During POE1, Eder will become loyal to Watcher and participate in his great quest, while helping people because he is a benevolent person. He will understand that he too can help people at his level, that’s what he tells us at the beginning of POE2. Thus, during the first game, Eder learned to do without landmarks, he discovered the true nature of the Gods and learned that he could never really know what had gone through his brother’s head.So that’s why Eder does not mention his brother in POEII, because he has evolved, the author explores other themes of the character in the game.
Did you play to the game ? This is literally mentioned in the first few hours.