I'm not an expert on human development or biology, but I think one could probably make the argument that stomp pedaling during development ages could lead to long-term damage of the knees.
We've seen it in a ton of other sports. Baseball, in particular, has pitch counts to limit how much throwing a young pitcher does. There is plenty of evidence to show that the wear and tear on an elbow and should can last a lifetime.
There's also a growing body of evidence on ACL tears in younger athletes, especially young women playing soccer, basketball, and cheerleading.