I used to think gymnastics coaches were Eastern bloc hardasses who didn't know the boundaries between "tough coach" and "abuse." The stories however are much more bizarre and go beyond "you can't eat fries." Like the obsession with no water intake, Kim Zmeskal cutting a black girl's braids, and of course Larry Nassar. Also i know injuries are part of sports but some of the untreated injuries are just beyond what I could have imagined. It's just bizarre and speaks to a toxic culture that can't be explained by "oh they're from the Eastern bloc and are really strict."
Eastern bloc hardasses influenced coaching techniques across the sport, and especially after USAG appointed B&M to manage women's gymnastics. Nonetheless, I agree with your take on the stories being much more bizarre. I hear about or read things that make me believe some coaches simply get too caught up in their students' worlds both in the gym and particularly outside of the gym. I think they're prone to veer away (some significantly) from their roles as a coach. The coach/student relationship or line becomes blurred in a very dysfunctional way. I also think some of the female coaches try to be "one of the girls," e.g., like some parents who try to be their child's best friend when what they need to be is their parent.
Kim was chopping off braids; Miss Val was urging her students to gang up on a teammate. None of this is justified behavior or anything that one would ever see or experience with a rational, even-keeled, dependable coach or coaching staff.
Also, a nutritionist/dietitian sports recommended diet is one thing that athletes all across the sports world adhere to, or try to, anyway. However, ott, strict diets such as no fries ever, etc. that's certifiable stuff right there. A small fry now and again is not going to derail a gymnastics career. Take Michael Phelps, for example, swimming, a different sport, altogether, of course, but the guy eats like a horse. He has to because of the calories he burns up. My point being, any gymnast who has indulged in, say a scoop of ice cream, is probably going to burn that off pretty quickly.
I think there needs to be a considerable reset between a coach and their students. I prefer the John Nicks approach, where he drew clear lines of 'I am your coach, and I will give you 100% of my time and attention on the ice, mutual respect, plus, a safe, secure, and comfortable training environment. However, I am not your parent, your buddy, we won't be hanging out together, etc., etc.' I think when that line is crossed, things get complicated and then emotions of how you can interact with each other can become convoluted and messy. A coach should never feel like they can go up to their student and lop off their hair, etc. That crossed a line - big time.