the ONLY reason to breed (an existing breed or create a new one) is if it serves a purpose that no other breed serves, or performs a task better than another breed. for instance (I hope no one does this) if you thought a german shepherd crossed with a border collie would be a better herder do to having the gsd coat rather than the long coat of the border collie, would not get tangled or packed full of burrs. cross a bloodhound with a siberian husky, the stamina of the husky with the nose of the bloodhound.
the labradoodle began in that manner. attempt at creating a retriever for people allergic to dogs. it failed, people were allergic to the cross breed as well. and the dumbest part is that the poodle originated as a water dog. so they could have just used the poodle as a retriever.