It's a problem with these alt-universe stories in general. Writers relish the added emotional punch of piling on death scenes they could never get away with otherwise, but after you see a few of those arbitrary superhero slaughters, you've more or less seen them all. The best What-Ifs (and Elseworlds) look elsewhere for interest or are very restrained in their bloodshed.
That's a solid observation. It's not the typical bit where they get mowed down in a panel each by a relatively impersonal force; it's Dark Phoenix being rather specifically cruel to each one in turn.
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