I love the new arrow function and the high-impact argument visualization. But I think the default option is that the arrows go up, not down. The arrows are supposed to indicate the direction of support. So, premise P supports a conclusion C if P gives us a reason to believe C, which means that the direction of rational support goes from the premise to the conclusion. Hence, the arrow should point from the premise to the conclusion. This is how argument mapping has traditionally been done, at least, for many years: https://en.wikipedia.org/wiki/Argument_map