That’s super interesting! Because, ahem, I use my food processor to make it. Now that we’re getting into fruit pie season, maybe I should try it. But working with all those cups of flour on a board! Eh Gods!
I just put the flour in a big bowl, add the diced butter, and cut the fat in inside of the bowl, using two table knives or a pastry blender. Keep everything super cold - I chill even the flour. Then pour in the ice-water, mix it up/knead as little as possible to hold together, and chill again before you roll it out.
It’s always worked for me, and I was disappointed whenever I did it in the processor.
-JT