It's superfluous because the arrow already points in a direction; the line animation doesn't tell you anything the arrowhead doesn't.
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On the example animation not all paths are taken, so that is one bit of extra information that the animation does provide. Though even if it was fully identical, I do find it considerably easier to see where the data is moving based on dots tracing out a path than I do by scanning for small arrows in a massive diagram, hence my confusion on this. Fair point though.