1) She disintegrated the telefloronics. It is in the panels below, which show them in the process of what looks like vaporization. “Large-scale destruction” is what Quentin Quire attempted, i.e., breaking their necks, and it didn’t work; they regenerated.
2) She’s headlining the flagship title as a co-leader; that’s a pretty big plot thread. Furthermore, whether she has been or is currently involved in other plot threads doesn’t definitively determine the role she may or will play in said threads. The fact of the matter - and really the only thing I am trying to point out - is that
we simply don’t know. Finally, circling back to her pivotal and central role in X-Men, I think it’s safe to assume she will be woven into many upcoming threads. However, as I stated, that is an assumption, as is what you are claiming.
Additionally, I am not arguing that the Phoenix Force is not a central plot point in the Avengers current run; it certainly is - for the
immediate future, as you noted.
3) Hickman also defined Jean as “prominent” in his story, i.e., HoX/PoX and, I’m assuming, the aftermath. Again, we don’t know what his plans are for her and can’t assume what they are based on how little or infrequently he’s chosen to use her thus far. That is conjecture. I am not claiming that he does, but he may very well have the bulk of her “prominent” role set to emerge during the denouement of his story. Again,
we don’t know. And just to be clear, I’m indifferent to whether he does or does not include her in his particular thread(s). Of course, I’ve taken note of the fact that he’s referred to her role in his story as “prominent,” but I’m content and more focused on her being co-leader of the new X-Men.