This is honestly over-reacting since his major appearances have been Hellions, Immortal X-Men and his clones in Duggan's X-Men.
He doesn't appear in New Mutants, Marauders, X-Force, Wolverine, any of the Tini Howard or Leah Williams books.
If you think he's the main character then Gillen is doing a good job with him.
But yeah, these Destiny retcons are bullshit. Not even Claremont kissed her ass this much.