I am not sure how the Final Execution saga was even worthless as an X-Force comic. It's one of the most deepening storylines in terms of moral ambiguity with X-Force characters learning how far it's gonna stake if they don't put the pieces right.
Apocalypse Twins are not just killer designs and they too have some compelling storytelling that started from UXF. It's really not just too easy to bring a Celestial to destroy the Earth for incriminating the Celestials. It goes way back when Thor used Jarnbjorn again Apocalypse.