stoekli has a crazy q/a procedure. Im pretty sure they make well over 100 pair/day.
Honestly i would argue the opposite:
-the bigger companies (that havent outsourced their manufacturing) actually have money to invest in automated equipment that actually processes materials much more consistently than processing done by "hand and eye". hand and eye could be more accurate depending on instrumentation and measuring practices. Ive never seen better edge fitment than i have on wagner skis.
"there are only two edge manufacturers..."
even if so, CDW offers so many different edges. you can get different shapes of tines, thicknesses, widths, rake angles, different compositions of steel. all of these change the skis durability on rails. one brand to another could use VERY different edges.
check out this brochure.
https://www.dropbox.com/s/iui9spzx6kd3hk3/CDW EDGE - brochure.pdf?dl=0
IMO when people (including myself) complain about durability, i think they are more complaining about material quality than craftsmanship.