>Why didn't they show what happened to the X-Men? They did in
>Old Man Logan, do it here!

it would've been another 10 minutes of tacked on flashback/dialogue that doesn't help with the current narrative. the movie explained well enough that mutants were endangered if not a few years away from outright extinction.

an opening montage of all their deaths, or Charles having a random conversation ("remember when Scott and Bobby used to..." *emotional musical cue* *Logan explains out loud to audience how they were killed and walks out in anger*) adds nothing for me.