As a vegan, I like to experiment with recipes - often just taking ingredients out and seeing what results.
I've lately developed this method for pie making, which I think, simplifies everything down to the basics.
No:
Milk, eggs, marge, butter or lard;
No need to chill;
No rubbing in until the mixture looks like breadcrumbs.
No faff at all, simple mix, roll out, place in pie dish and fill.
The pie shown here has a filling of a Thai chilli non carne, and took about 33 minutes from start to finish - 18 of those in the oven.