You are correct, the riser on a compound is cut way past center.
The tiny vanes on a compound arrow are very stiff, and can be, because they don't, or shouldn't, come into contact with the bow at any point.
Also, you can adjust your rest, up and down plus side to side, to get your arrow coming out of your bow perfectly straight, eliminating the need for as much steering power on the back end.
When I first got into Trad I couldn't understand how you could tune your bow by tuning your arrow
Im a better archer and have a better understanding of archery today because of switching to Traditional equipment.....