There’s no actual evidence that Lightforging itself does brainwashing at this point, just edgelord fan theories.
The closest thing to evidence of brainwashing is a twisted interpretation of one character’s words - Geya’rah - and that scenario was a one-sided snapshot of the situation. Addendum: evidence for my claim;
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- If Xe’ra could brainwash Alleria with Lightforging, why bother imprisoning her? If Lightforging was brainwashing and Xe’ra would force it on the unwilling there’s no reason she wouldn’t have used it on Alleria.
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- Xe’ra’s attempted forced Lightforging of Illidan doesn’t necessarily mean she’d control his actions. She could’ve just swapped his fel magic for the Light.
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- The Lightforged Draenei didn’t defend Xe’ra when Illidan attacked her, nor did they try to harm Illidan after he killed her, either of which would’ve happened if she’d brainwashed them (that Turalyon attacked Illidan rather than them indicates there wasn’t mind-control involved).
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- Why did Turalyon and Lothraxion challenge Xe’ra when they thought she wanted to harm Alleria? The fact that they directly challenged Xe’ra on a major issues proves she wasn’t controlling them.
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- There are ways to brainwash people without using supernatural power, what’s to say the “Lightbound” didn’t use those instead? Name one character who is mind-controlled by the Light.
“Lightbinding” at this point is a theoretical concept, but seems distinct from Lightforging.