I also wish they didn't use horns, but not for the same reason. My main objection is that this looks to be an elongation of the external occipital protuberance, which is a part of every normal human skull. So kids aren't "developing horns," instead their bodies are adapting to the stresses involved with looking down for hours on end.

Also, this isn't a bad thing, it's how our bodies work. Kids who do gymnastics or swim a lot have bodies that develop differently in response to those stresses.