These are meant for putting on and laying motionless on the couch. The slightest friction will set off a never ending domino effect of pilling - and not the kind where it bugs you but no one else will notice.
I wore them to walk my dog around the block. In the leisurely 15-minute stop-and-go stroll they became pilled beyond recognition, and no amount of de-pilling seems to bring them back. So they went from $100 “nice” perhaps coffee-shop-appropriate sweats to junky old sweats in the first wear.
They are also HOT, which was great for my weather but won’t suit everyone. They’re good below 50°.