If you cut everything squarely and don't stretch the bias pieces, your quilt goes together in half the time.Points and seams meet accurately, no seam ripping, no re - sewing and quilts hang or sit squarely and do not look 'wonky'. The quilting is easier as well as there is no bunching up. Ask any long arm quilter if they prefer to quilt a well pieced quilt or one thrown together and the answer is obvious.Even when you are making crazy quilts you still square the blocks up. Paper piecing is the easiest way to keep bias and straight grain pieces working together and one instance where grain isn't so important.