Fairies have an extended lifespan. Powers actually don't factor into any of the reasons that the Team bans certain life states.
You can throw a potent cure elixir at a genie and it won't be a genie anymore, which is why cured genies (and by extension, cured anything) are allowed. Please note that any cured occult must be cured before they are moved into the household.
Resurrected sims are allowed under a few conditions. A sim that is dead at the start of the game can be resurrected because they're more like a weird, frozen NPC. A sim that died after you started the game has to stay dead. And Oh My Ghost isn't allowed to resurrect anyone.
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Oh, and on a tangential note, why is Oh My Ghost under a flat ban? It might have been understandable before Supernatural where there weren't any other ways to resurrect ghosts, making it a consistent resurrecting ban, but since we're in a time where resurrecting pre-made ghosts is okay through other means, I find its banned status confusing.
(If I sound like I'm being difficult, that's absolutely not my intention and I apologize if I sound that way)