All these traits are especially well suited to sheep herding, but as a house pet, such traits can often get them into trouble. All that inherent energy has to go somewhere. And I have unfortunately seen it come out numerous times in acts of aggression towards strangers. This dilemma is by no means unique to Aussies. Many working dogs bought and kept for the sole purpose of companion can become bored or depressed and take on roles and functions on their own.
Dogs seem to genuinely take pride in their abilities.
I recently met a black lab mix who made a game out of flipping his collar up in attempts to catch his tags in his mouth. Just like people, when dogs are active and doing something they enjoy and are good at, they are more contented and relaxed. Many dogs that are bored get their energy out by becoming super-protectors. They are asserting a natural tendency that is fitting to their circumstances as house dog, often to the dismay of owners, particularly when their energy is funneled, beyond alertness and vigilance, into excessive barking and aggression. Home life can bring other problems too.