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I think of it as more like Lila Cheney's teleportation. Lila can teleport across galactic distances, but not from one side of a room to the other.
Also, as for her being more than she seems, that's an interesting concept. In any case there should probably be a list of stuff she can and can't do and what her role really is and how she plays out. Where did she come from? Did Franklin and Owen unwittingly create her and other multi-dimensional entities?
We'll see if she ever comes back I guess.
That's a common desire among most of us FF fans here. But, the situation the team found itself in was heavily Reed designed and getting out of it made a heavy Reed influence necessary. I'm holding off until issue 651 after the wedding when we see the FF actually back home and dealing with their lives, not getting home or having a wedding in special cases.
I would have preferred for some other way of defeating her like maybe Franklin pooling all the heroes and all his creations power together to overwhelm her or something or perhaps give her a telepathic dose of her victims anguish (I know rehashed ideas yet... better somehow than what we got) but I agree that it was refreshing the arc wasn't stretched out and she got treated as such appropriately ie she isn't important apart from a plot device for the return of FF.
Considering how apathetic she is and that she's an abstract entity, I doubt that would work. Personally, I would have trapped her in the Cancerverse. A being with power over destruction and death stands no chance against the Many-Angled Ones and their ability to twist the nature of life and existence to be ever-growing. Even if Griever wins, she's still trapped in the Cancerverse.
Is reed OCD or something? Why devote so much time and energy to the entropy of the universe, which is presumably billions of years away?