LOL Quentin Quire is Jean Grey. Riot at Xavier's is a thematic sequel to the Dark Phoenix Saga. I didn't like QQ at the time either, but now I hate him. That sweet spot where I understood the point of his existence before later writers decided they needed to resurrect him (see? Phoenix!) was a lovely time for me.
Magneto wanted to move the X-Men past Magneto and Xavier's ideologies. Magneto's was easy. Xavier's took a LONG time. NXM ended with Cyclops taking the reigns of the future, which worked for a while.
HiX-Men is about a whole new ideology that swallows everything that came before and possibly after.