Anduin because he’s poisonous to all the characters around him and is used as the writers mouthpiece for morality, so being in a position of power and high king of the alliance military? That really ruins the alliance’s story and makes everything insanely uninteresting.
Sylvanas, everyone she fights has to be written as pretty stupid because the writers aren’t clever enough to write, so we get someone with below average intelligence beating someone with a room temperature IQ. Plus her anime powers are getting out of control, all because that writer has her as his waifu so he can RP as nathanos on twitter.
I don’t know about a third, maybe Thalyssra? She was saying “we want to rejoin the world as protectors of Azeroth, not conquerors”, so she sticks with the faction trying to conquer the world and committed genocide, and even passionately fought for them afterwards. The faction that was trying to exploit the literal lifeblood of the planet for weapons of war, all because Tyrande asked how could we trust you, before Tyrande helped save the nightborne and their city. So she comes across as insanely petty to me, when she seemed totally different in legion.