Bender....the high speed photography of which you speak doesn't show the arrow bending around the riser.
It bends against the riser due to the way the string leaves our fingers, and the fact that the arrow is laying against the bow, and that the arrow which is at rest and has a certain amount of mass, suddenly recieves a thrust of energy from the bowstring. It's EXACTLY the same reaction that you get if you take an 8' piece of 3/4" ( or so) piece of PVC pipe, hold one end of it against something solid and push the other end. The, do the sme thing, having a person stand on the left side of the pipe (to mimic a left handed archer) or the right side of the pipe to mimic a right handed archer.
That's why when you shoot the same arrow, from the same bow, using a mechanical release you can shoot an arrow that's stiffer. The string returns to brace in a straighter line.
What could be more confusing then to infer that an arrow bends AROUND something?
And, this is something that is very easy to demonstrate for yourself. And you can either do it with the bow you shoot regularly, or a PVC form bow. Mark the center of the limb of your bow, draw to your anchor/sighting reference, align the string and the center of the arrow with the target, and pay no attention to the point of the arrow in relation to the target, and if your bow is set up outside of center you will shoot left every time. Provided you are right handed. Do the same thing, and align the arrow point, the string, and the target, and you will hit vertical center. There is only one exception to that rule, and that is wildly over or underspined arrows.
The whole aligning the oscillating nodes thing is over complicated hooey.
How would the arrow bend around the riser it would be traveling at an angle that would forever increase how far left or right (depending on the handedness of the archer) which would require to you aim further left or right as the range increased.
The arrow travels in a straight line dependent on 3 things.
The draw/force line of the bow. How the string returns to brace.
The orientation of the front and back of the arrow to the string or draw/force line.
The orientation of the string, the point of the arrow, the draw/force line, and the target.
As Rick said, a properly tuned arrow leaves the rest within just a few centimeters of forward travel. And then it returns to the path created by the draw/force line of the bow.