Except we don't even know if this is, in fact, the situation they were in. I think pretty much everyone has been in a position similar to the one you just described, and most people can tell when a figure of authority is there to help despite the toughness of the methods it may use. After all, it's all displayed in the results, so it's easy to tell that figure is getting the job done, and so it's good to have it around.
But it's because of how common these situations can be that we're prone to try and see every single hardship this very same way. We're stuck with the perspective you have, the one in which being around someone that makes us good in one thing is needed, even though it may affect other parts of ourselves, when it may not be the case. Not every negative relationship has the potential to be productive, and having good results in the short term shouldn't always be tempting enough to sacrifice your health, being physical or mental.
Sometimes the hard path is to take the risk of changing the already proven as effective routine in order to try to have a more healthy one. Being happy doesn't equal lack of success. Having a respectful and positive team around you doesn't mean you're gonna get spoiled and complacent. It's about striving to be the best version of yourself all around. If you feel you're prepared enough in your abilities to do your job well, it's okay to try to change the other thing that's not working in your life. In Naomi's case, she already achieved success with a situation she's not happy with, it makes sense she wants to try to achieve success with one that makes her happier.
