Do You Think Information Asymmetry Matters in Stock Trading?

Last year, stocks held by Democratic lawmakers rose by 31%, those held by Republican lawmakers rose by 26%, while the S&P 500 index rose by 24.9%. However, Duan Yongping, often referred to as the "Warren Buffett of China," stated in a speech last week that information asymmetry has little impact on stock trading. He argued that investing is not a zero-sum game, whereas exploiting information asymmetry is essentially a zero-sum game. ------------------ What do you think? Is information asymmetry important in stock trading? What do you believe is the most crucial factor in investing?