Word up. Although note that all poly is not created equal. It may be hard to believe, but the poly from just a decade ago was very different. There were essentially zero boutique “craft string” makers selling through retailers before G String and a bit later, Kitty. And before YYN “Highlights” upped the standard of the poly available, I ASSURE YOU, the thin, shiny type 6 polyester strings which were out there would both melt into a rough ProYo or Russel axle leaving a weird streak in the wood AND ignominiously snap after a few minutes. I don’t know that cotton was better due to its properties or if it was just thicker, but there IS historical basis for the adage. I will note that I have never seen that phenomenon with Slick (50/50) type 8 string or with the thicker, stiffer modern poly I’ve used. And regardless of whether it’s due to conditioning or tactile sensation, I will still go for type 10 cotton for wood every time.