[QUOTE=Rackonteur;8723979]
So the horse will ground tie. https://horsesfortrail.wordpress.com/2012/10/22/jack-ground-tied/[/QUOTE]
And being able to keep a hold of your horse (colt) when you open and close a gate or getting off to doctor cattle after you get them roped.
Western gear was born out of necessity and usefulness not just what the latest clinicians can manage to dream up to sell.