Sooo I have been on a binge on these amazing Genshin Impact stories and content and I just had like a revelation while driving the 40 minutes home from work yesterday.
A lot of these Genshin SAGAU feature Imposter!AU where the reader gets sucked into the game universe and is treated harshly. And then I remembered the Liyue quest where in order to be able to meet Xiao, the inn owner had you interact with a spirit in her care to be able to safely interact with Xiao because he is a higher entity with a special aura or energy that will weaken you. AND THAT'S WHEN IT CLICKED FOR ME! THAT'S why everyone in the Imposter!AUs are after the reader, because since they are technically the highest entity of their universe, their aura is 1000x or more dense than that of our favorite higher beings in game. Its why they go on a frenzy to kill you, because of the energy you posses. What makes it even BETTER is that some AUs also feature an acolyte that will instantly (or at least have their suspicions) recognize you as the true creator and not an imposter when you descend, because they were your main/favorite to use when playing the game in your world. They are already more used to your aura they have that resistance.
....but this is just me babbling