No one likes "hero vs. hero" events because every story has a protagonist and an antagonist, and having someone who's classified as a hero be the antagonist of a story is contradictory, especially when the writer is bad and doesn't know how to make the reasoning compelling to at least justify the conflict.
Inhumans vs. X-Men could've ended on day one if Storm and Crystal had frozen the cloud and crystalized the Terrigen. End.
How could A.X.E. end today if they used characters wisely instead of ignoring someone's power to drag the story for a company event? How could've Civil War, Civil War 2, Avengers vs. X-Men, etc. have ended if they weren't forced to unnecessarily drag out these events for Marvel, but went about it better storywise?