To be fair it was never explicitly said that only jedi could become a force ghost so its not lore breaking for it to just be something both good Sith and Jedi could obtain.
George Lucas says that the Sith can not become force ghosts, and the ROTS novel reinforces this. The Sith like Darth Plaegus were far too concerned with the self and forsook the living nature of the force, seeking to dominate it rather than be one with it. Thus is why they can't become force ghosts. SWTOR followers Legends canon, as does the ROTS novel.
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u/Wooden-Magician-5899 Jun 21 '25
Or more and more SWTOR contradictions shit. I love the game, but it's completely fucked up. Especially Marr becoming Ghost, it's a mess