There has been a great deal of speculation as to why Sylvanas is doing, well, all of this. It is quite clear that the Shadowlands are broken and Sylvanas wants to destroy it and replace it with a better system according to her and Zovaal’s design. What does she seek to replace it with?
Well, whatever it is, it is definetly not going to be better than what we already have. Sylvanas complains how people are not able to control their own fate, and sends thousands of people screaming and burning to their deaths. She says she will set everyone free, then sends the souls of everyone she has killed into “eternal torture prisons”, where the lucky ones are destroyed, never able to experience her supposed “freedom”. She wants to end the system in which people are just puppets being played by greater cosmic forces, while simulataneously abusing, deceiving and controlling anyone alive or dead for her own power, all with the promise of “it gets better eventually”, without ever asking for people’s consent to “aid” in her plan, or even informing people what it is.
Whatever new world of “freedom” Sylvanas has planned, it will not be an improvement over the current Shadowlands.
But even if it were, it would not matter. Why? Because Sylvanas has no way of realizing her ambitions. She is not the one running the show. Zovaal is. He is the one who decides what the new world will be like. And based on everything he has shown us so far, it will be infinetly worse than whatever mistakes the Arbiter made.
Sylvanas plan is literally to give the most evil person in the universe, a guy whose literal job it is to torture souls for eternity, unrestricted power in the hopes that he will suddenly turn over a new leaf and make everything better. She looked at a guy whose brand of magic is literally called “domination magic” and thought he was the champion of freedom.
The person whose entire scthick is “abandon hope”, is basing her entire plan on hoping that the antithesis to everything she claims to believe in is just making his entire existence a performance.
After Mal’ganis, Putress, Galen, Godfrey, Vereesa and Saurfang, you would think she has wisened up to obvious betrayals, but apparently she is suffering from very real brainrot.
Which is why arguing about what she wants to accomplish, whether it redeems her or vindicates her is pointless, because she is just a tool. Only Zovaal’s ambitions matter, and, well, there is a reason the Maw zone is rather unpopular.