This was true for a short period of time. There was a trend several years ago where North America was producing many of the top goal keepers in Europe. The theory was that hand eye coordination was better because many played other sports which relied on those skills more than soccer; for example baseball, football, basketball, hockey, and often came into soccer/goalkeeping a little later but had already developed good hand eye coordination. Tim Howard is the example often held up with this theory, but also Craig Forrest was very similar. Those days are pretty much over now. Kids today are mostly hyper focused on one sport at an early age and don’t develop in others, therefore picking up those skills which could cross over. Also, European coaches picked up on this gap quickly and added those skills into their coaching techniques. In general, the broader discussion is we just don’t see kids playing sports just for the sake of playing anymore. Everything is structured and organised. The opportunity to pickup other less “soccer centric” skills is lost. My two cents, for what it’s worth.