It is absolutely insane that it has been around as long as it has yet is still being used in the vast minority of textile shops.
There are a lot who have probably never heard of it. I hadn't until reading about here on TSB. Our usual suppliers don't carry it, and I never encountered any articles about it, so it wasn't even on my radar. And I've been kicking myself, because we ordered a bunch of new screens just before learning about it here. Next round of screens, though, you guys have definitely convinced me to get on the S-mesh train.