Visual programming have the advantage to be more approachable to non-programmers. In the gaming industry, you need a tone of small event reactions and logics to make great game. If you push all of those needs to a separate programmer team, you add complexity to your production and lower your agility. Given live editing supported, code will always be more efficient for programmers but getting all the talents (design, level design…) that are also fluent programmers may be unrealistic at scale.