I foundation piece all the time (can't cope with pulling papers off
It produces greater accuracy and I even now try and find a way to pp different traditional patterns I once pieced by hand or machine. I have foundation pieced miniature right through to large lap size quilts, usually scrappy.
A friend just started quilting under my guidance and she did a foundation pieced scrappy quilt as her first - she loved that she could follow the lines (she had never used a sewing machine before) and her confidence grew so much with each block she completed. She is now well on the way with her 2nd quilt and is super keen.