Obviously, there is much value in a PTC. And the BSA wants to encourage utilization of the PTC. If offering a square knot will encourage it, why not. Too many people get their undies all in a bunch over people that look at things differently than they do. If wearing a bunch of knots on your uniform is your thing, fine, if not wearing anything on your uniform strikes your fancy, equally as fine.
Just don't criticize the people on the other side of the fence.