The sweaters I made didn't but they were all non synthetic, mostly single fiber type yarns of good quality. I didn't use cashmere, as I made mostly sportswear type sweaters, and alpaca is too fiber shedding for me although it is lovely.
Yarns intended for hand knitting are probably not processed the same way because they aren't fed into machines for mass production.
I'm sorry you were disappointed by Naadam, in my experience cashmere, while warm and soft, is delicate no matter how long or fine the thread and maybe it's not possible to really know for sure how your clients wore their items, especially if they had high expectations of durability.
I also completely agree with Rachylou's comment in today's blog post, things are most definitely, fundamentally, not what they were, in the building business the quality of wood has changed dramatically as there is very little old growth to be had.