Merino wool trousers sit in a demanding category. They need to look refined enough for daily wear, move comfortably through sitting and walking, resist abrasion at the seat and inner thigh, then...
Merino wool pants sit in a demanding product category. A merino tee can succeed with a beautiful hand feel and a clean fit, but pants have to survive seat abrasion, knee stretch, pocket weight...
A fabric swatch can tell you that viscose is soft. It cannot always tell you how a dress will hang, how a blouse will behave after steaming, or whether a pant leg will hold its shape after a full day...