Chinese training is incredibly extreme, but stretching kids to the point of tears isn't that big of a deal IMO. When I was young plenty of the kids in my group cried while being stretched. Because it hurts! And when you're a kid, you cry when things hurt. You get over it. But you have to get them flexible when they're young otherwise they never will be. Americans don't do that and you can see it in their gymnastics.
The scary thing IMO is that these kids have little choice in whether they want to continue or even do the sport in the first place.