Hhmn, I thought I had better add this, what I mean is I haven't tried her method because I have been doing cookies for many, many years the same way. Not that it isn't a good way to do things, I am sure it is, I just haven't tried it.
I have a tendency to put a pinch of cream of tartar in a lot of things, including some shortbread cookie recipes, again for its stabilizing action.
But I am an old brawd heehee and I have old habits that I tend to stick with, that is all.
Every year at Christmas time, I make between 1000 and 2000 cookies, some of which are decorated cookies. I don't do as many decorated as I used to because the people that I make cookies for are not big on decorated cookies. But I go back to the days when I would decorate cookies by hand with a toothpick, didn't even have an icing bag or parchment triangles or anything, just a spoon and a toothpick. You know, the Stone Age of cookies, haha! Just an old brawd that likes to bake here!