Personally, I think King's stories just don't translate very well to movies, unless (as with Kubrick's "The Shining") huge liberties are taken with the source material. Most adaptations I've seen of his stories were just bad.
The baseball scene alone is famous for taking 127 takes.
The life of an actor on a challenging shoot can definitely have an impact on their physical and mental health and Kubrick was notably one of the most demanding and meticulous directors. It's just a thing, similar to Elon Musk in business. The results are wildly successful and most involved were likely aware of what they were signing up for, the sacrifices that had to be made to work with one of the most revered in the business and to create high and lasting art. Unfortunately for Shelley I don't believe she had the mental constitution for it.
Also keep in mind that people in the public eye are going to want to craft a narrative when it comes to their own legacy. At the end of the day most would want to be remembered more for their accomplishments than the difficulties that went into achieving them, esp. when it comes to their most culturally significant work.