Nothing wrong with any string material, as long as it works for you. Here I am, a hard-headed, curmudgeon, who hasn't got a huge inclination to experiment with new stuff. For a lot of years, over forty, I used dacron B-36, B-43 and B-50 with dedicated fervor...bullheaded you might say.
Recently I tried a few skinny strings...with padded loops, and serving the same size as bigger strings. Made a new bow out of my old one; quieter, dead in the hand, and yes, a bit faster.
What I really liked was the quiet mmmmp of the shot, and the quiet of the bow...not vibrating after the shot. It's more fun to shoot, and appears to allow a cleaner release.
GMMAT....What us old coots "pride ourselves in", is our ability to hit the target when we shoot at it. We also don't mind trying something new now and then if it makes the experience better overall. Not just faster son, better.
I also thought the quest was only for more speed, but I was biased from forty years of being bullheaded 8^). Once I gave it a fair try, I found that there is much more to the skinny string than a simple fad.
I've been doing this "trad" thing since the mid 1950's, so I'm pretty dry behind the ears. Pretty faces don't turn my head that quickly any more, there has to be more substance. Consequently, I believe the skinny string is more than a passing fancy since we now have the material to make the process safe. Don't knock it, until you try it.
I still have a bow or two that simply likes the old dacron best, so that is what I use on them. I also have two that really like the skinny 450 that a friend made for me.....6 strands, 12 strands in the loops. Room for all I suppose.