Very nice topic. I had the same troubles in the past and I like that you dedicated the time for the experimentation,brainstorming and the post.

My opinions differ from yours for many reasons. The reasons are so many that it would take a book to answer fully. That's why I'll prefer to answer through my videos.
So my short answer is: that the y-sling and the sling are completely different devices, and the y-sling can be replaced by single weight bola but the sling cannot.

AncientCraftwork wrote on Jun 19^th, 2020 at 10:50am:

I guess it would depend on the application - In sporting events/target shooting, for instance, a need for accuracy would suggest a Y-sling. In other cases though, the sacrificed power might be important - For instance, while I don't know much about hunting, from what I've heard, it's important to kill your quarry quickly (So it doesn't run off into the forest, severely wounded and traumatized) which (depending on the animal) might require more power. On the other hand, hitting one's quarry in the right spot on its body is also important to that end, so who knows? I suppose you'd have to gauge just how much power it's really sacrificing for accuracy before drawing any meaningful conclusions though. It's an interesting question to be sure.

Well, Sarosh and Jauke... I disagree with both of you
I don’t think the Y is a different thing at all. Mechanically speaking, a cord is released, the pouch moves out of the way, and the ammo rolls out. A traditional sling releases the ammo to one side of the cord. A y releases it between two cords. Is that really so different? Nor does the Y necessarily eliminate all rifling. Jauke’s Y is designed to minimize rifling, but you could easily design one that intentionally rifles more.

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Interesting topic. If these merits are true, then perhaps it could be quite good for close range target shooting. However, personally I find the rifling effect to be quite important for power and accuracy, as the river stones I use go quite a bit further and straighter when stabalised point-first (I regularly sling out to about ~70y). Also, I don't understand how a 'Y' pouch sling could be any less powerful at point-blank ranges.
I'll have to give one of those slings a try.

I have a camera that can film at 1000 frames per second. I will modify the Y that Jauke sent me so it is the same overall length as one of my asymmetrical slings, and maybe I’ll throw together a more traditional split pouch in the same length too. We can just measure the spin directly on several throws with the same style from the same position at the same target. Let’s just see how the speed and spin rates really compare... in my copious free time, of course!

To make things more scientific, I can even randomize the sequence of sling throws so there are no fatigue effects and try to make all three slings be about the same weight, so we are really just measuring the effects of the pouch geometry and release timing.