What we see with Sylvanas Windrunner is the classic situation that happens to any redeemed villain. Since they are no longer "villains" for the sake of the Story, they lose their Villain Plot Armour, which made them 4000 IQ master minds who are ahead of everyone. Remember how Sylvanas was ahead of everyone in BfA (like how she manipulated the entire Alliance at Lordaeron, because they were the Lawful Stupid good guys and she was the villain)? This is NEVER happening again and we see this in the latest patch, where Sylvanas is acting like a retard alongside Jaina, Thrall, and Bolvar, who are certified Good Guys.
A classic, it always happens, you either die a Villain or see yourself become just another Stupid Hero
Now that Sylvanas has been redeemed and has become a good guy, she has been "demoted" in the eyes of the Story, she has lost her Villain Plot Armour and 19999IQ chess brain, and will now act stupidly like most good guys do
I hope Sylvanas enjoys being part of the Bland Gang, but don't worry, she's still not as pathetic as that burger Baine, who actually spent an entire year staring at a wall.