My vote is that BioWare realized that most NPCs will die at some point during the game, so making Imoen impossible to resurrect would ensure that very few players (other than dedicated re-loaders) finish the game with her. And that would be kind of sad.
Pretty prosaic, but you're not likely to find an in-game explanation. No more likely than an answer to the age-old question "Where did Imoen's belt come from and how did Irenicus take it off?"
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Do not meddle in the affairs of wizards, for they are subtle and quick to anger.
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