I always felt the Dark Phoenix would have been easy enough to adapt going from basic plot beat to basic plot beat without having to go cosmic. After Jean goes Dark Phoenix, instead of going into space and eating a sun which destroys an inhabited planet, she eats a nuclear power plant reactor which irradiates and kills an entire nearby community. Instead of the Imperial Guard coming after her, it's a team of government-sponsored mutants. That they did the same story and made the same mistakes twice is mind-boggling.