It has never been true for any modern wristguards that they simply move the break. There were two documented cases of extremely primitive rollerblading wristguards where they broke their arm further up, but no causality was ever actually established. Modern, well designed wristguards dissipate a ridiculous amount of force, the one I linked is one of the most effective, but is fairly bulky. Others are maybe not as effective, but more streamlined.
Wrist guards for snowboarders - www.ski-injury.com - Ski Injury