I spiral wrap all of my personal casting rods. The biggest reason is because there is no down side to it. Only ups. The only downside anyone has ever really been able to come up with is looks (very subjective) and they are a little more difficult to get in and out of rod tubes.
Benefits to spiral wrapping as I see it…
1. Eliminate rod torque. With the guides on the bottom the pressure from the fish isn’t trying to spin the guides to the underside of the blank because they are already there and there is no twisting torque applied to the blank.
2. Eliminate line scrub. With a guides on top rod when you flex the rod the line can then touch the blank.
3. Reduction in weight. With a spiral wrap since line scrub isn’t an issue, fewer guides can be used. That helps with weight. With a spiral wrap single foot guides can be used even on the heaviest rods since there is no side pressure on the guides. The loss of an extra foot, thread and finish is a big help with the reduction in weight.
A reduction in weight (fewer guides, fewer guide feet, fewer wraps) is going to aid in sensitivity. All of those things add some encumbrance to the blank and reduce its efficiency in transmitting vibration.
You can see in this photo...two identical rods...one spiral wrapped and one conventional wrapped...both mounted in ball bearings...both with the same weight strung from reel seat, thru the guides... https://i163.photobucket.com/albums/t288/Otterods/Reference/Spiral.jpg The conventionally wrapped rod wants to turn upside down because of the guides being on top of the rod. Once turned, this rod is very difficult to turn back. The spiral wrapped rod remains stable.
And here you can see how a blank twists... https://i163.photobucket.com/albums/t288/Otterods/Reference/bentrod.jpg While most graphite rods can resist that force, it is still there. And if you can get rid of it, why not?