Here's some of what bothers me with the tiny strings. On paper, it makes sense that a strand that is 3 times stronger would let you get away with using 1/3 the number of strands...but paper doesn't take other things into account.
Load testing. I hope I get my terms correct here....the breaking strengths are tested under static weight (stationary), not shock load--I think that makes a big difference.
Flexing. Every string material I know of that has been removed from the market (removed, not upgraded) was due to failure at a flex point--usually the nock-set. Some materials act like a wire--when they get flexed at the same point over and over, it breaks down the fibers and consequently the string breaks. I don't know how the load strength correllates here, but I do know the strongest material on the market today is the one I've heard about breaking the most--by far. It's also the one that has been used the most in tiny strings to date--450+.
The other thing that bothers me is durability. I can break an anvil with a feather, and I've had folks with similar luck contact me needing a string "right now", because of a mishap. Usually a case where broadhead meets string (like putting an arrow back in a bow quiver at dark), but there's also fences, sharp rocks, etc. One or two cut/broken strands might end a hunt, or might not. Three or four might require a new string, or might get you slapped upside the noggin by your bow limb. Either one depends on how many strands you have to begin with.
Energy leaving the bow by way of the arrow beats energy being absorded by the bow, for longevity, performance, quietness, everything.
That's how I look at it, and what makes me wonder how dacron can be "easier" on a bow when it resonates all that vibration down the limbs at every shot. Another reason I don't care for tiny strings, is they can act the same way. All materials have some amount of stretch/creep. The lower the strand count, the more you increase the stretch/elasticity. Getting away from that is one of the main reasons I prefer HMPE materials to begin with. That, along with increased durability are pretty much the ONLY reasons--I'd use them if they were a little slower than dacron. Going with a tiny strand count takes away the two main reasons for using HMPE materials to begin with. That's why it puzzles me so much when I hear people brag on them....I just don't get it.