Actually, he's right if you think about it.

If Jean and the Phoenix have become one, it means Jean is something else and has a completely different agenda than the Jean Grey who was Marvel Girl, or plain 90s Jean Grey.

She isn't alive in a normal sense, as Endsong ended, she went to the white hot room to collect her missing pieces.  She transcended her mortal existence.  Now, she continues to collect her pieces, but she has a cosmic mission that is far beyond the things the pre Phoenix Jean Grey would have done.

When in full Phoenix mode, Jean Grey will not hesitate to burn away what doesn't work.  D'Bari, the bug people, an entire future universe, and the world's destroyed by the reconstituting Phoenix force as it heads toward earth to do its important cosmic work.