Excellent sarcastic response, but you might've missed the point. Even without video games it shouldn't be possible that nobody has ever thought of organizing balanced party compositions, before some famous adventurer named Selma came along to tell them they were doing it all wrong, with the roles of offense, defense and support based on what each member could do being apparently unknown to everybody before she came up with it.
You don't need to play video games or be a famous top-tier adventurer to figure out small adventuring parties are better off having someone who can defend, someone who can support and someone who can dish out damage. It just breaks suspension of disbelief.