Is “Suffered a major defeat at the Battle of Guandu due to ignoring advice” true?
attested in history
According to Records of the Three Kingdoms, Book of Wei, Biography of Yuan Shao, Yuan Shao rejected Ju Shou's advice to advance slowly, and his mistreatment of Xu You led to the fall of Wuchao, ultimately resulting in his disastrous defeat at Guandu.
Yuan Shao
In official history, he was a northern hegemon who was indecisive in strategy, while in fiction he is often portrayed as a stubborn and fatuous ruler.