Yes, it's what I said.
What you wrote after is just a long and convoluted version of "Stormwind with the full Alliance backing can't be taken so Sylvanas needed to make the Alliance fall first".
The Horde will never be the faction with the advantage since they are the "underdog" faction. It was like that in Vanilla, it was like that in post-MoP, and it will be like that again in the future.All of the above is predicated on the state of both the Alliance and Horde post-Legion, though; with both their navies in tatters and unable to coordinate a swift movement of troops should the need arise. This context has changed post-BfA and now post-Shadowlands, and with the time-skip added to Dragonflight we have no real way of knowing what Stormwind or Ogrimmar's relative strength is now that they've had time to restock and repair their navies and armies. The calculus of Sylvanas' Before the Storm stratagem is entirely different now, and even though the Horde and Alliance are currently in a state of armistice, we don't know which superpower has military superiority, or if they remain at a rough statement and detente.
That's why the Horde always resorts to backstabbing the Alliance and nuking them.
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I don't know what your post has anything to do with what I said. I never said Sylvanas' plan worked.