SHODAN is… Lost In Format Translation. Thankfully.
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If there’s never a System Shock 3, Shodan, in a suitably perverse way, gets the immortality she’s chased so desperately through both games. As she is, she’s unforgettable. If there was another game… well, Shodan is a villain and villains are entirely unlike heroes. Heroes save the world repeatedly, and each repetition increases their status.
Every time a villain fails to destroy the world, it lessens them.
They become less of a threat, and more of a joke. A second try at storming the Godhead was both new and good for Shodan, with her initial weak position and striving for the impossible goal being striking. There’s a determination there which is admirable, so lends her a little dignity. A third try and she becomes less the immortal, perfect machine and just another loser.