Like a lot of things, when you remove the human element, it can be beneficial. Consider mutants who are trapped, harming themselves and/or others uncontrollably, or want to make the choice to pass as a human by suppressing their mutation.
But, you cannot remove the human element. It can and will be used for power (subjugation, war) and profit; it will be used by totally misguided parents (see: eugenics and anti-vaxers exerting "choice" at the risk of the population). In the story, these "cures" must always be destroyed as soon as possible. I mean, people go enough out of their way to build giant purple robots to go after mutants -- do you think they won't weaponize a "cure"?
In terms of how and how often it is used in this franchise, like the Phoenix, Apocalypse, and Professor X having dumb dark secrets: They need to f*cking let this concept sleep deep within the earth for a decade and look at the multitude of other ways to explore the mutant metaphor in topical ways.