No pun intended - this is no Black Swan (the movie that is) ... and you may have seen other movies with obsessed teachers/dancers that try to better themselves or others. Of course the main character has to be flawed ... in our time and age (no pun intended) pushing people to the limit ... well there are limitations. I am not telling you that is a good or bad thing - though taking care of others mental health should be a priority ... and the future will show if the way we are choosing is the right one.
But this is also about a woman having to deal with age and beauty issues ... as in being replaceable ... yes this also is not The Substance ... great movie in its own right. So you can see, there are better movies out there to watch ... that doesn't mean this is a bad movie. Especially acting wise ... really loved the performances. Also very well shot and edited ... but something is missing ... is it the predictable story ... is it a special kind of twist that might have been needed ... saying it is "just good" almost sounds like giving the movie shade ... and I don't mean to do that. I also am not someone who would be able to push someone else to the limit ... by yelling or doing other stuff ... just be aware of that.