I define AGI as the only real AI that can exist. Anything less is just mimicry. To give a stupid/simplified example: a truck driving specialized "AI" would not be able to decide when to stop or not when somebody steps in front of it, making it trivial to rob "AI" driven trucks. To decide it needs to understand the kinds of people that exist, their motivations, the laws, etc. So it needs to be an AGI. Otherwise it will make horrible mistakes we don't even think are possible, or are so uncommon that when they happen to a human they make the news.