You also have to remember, while Judges do have a part in it, they can only Judge and place horses that are brought to them that day. It isn't always their fault how placings end up.
There are plenty of poor examples of WP, so I do understand how the current view on it has been started.
However, there are naturally slow legged, deep hocked, flat-kneed movers, being ridden by equally talented riders out there. These horses are quite versatile, and are equally athletic. It is not unusual to see top placing WP horses showing in Western Riding and other pattern events. At home, most of these horses spend little time 'on the rail'. They are being pushed all over the arena, leg yields, haunches in/out, shoulder in , countercantering etc. Just because a horse is moving in what someone may consider a slow pace does not mean the horse isn't engaged properly from behind. Butt froth is good after a workout