When someone asks me why it's necessary to sew to a foundation when I sew strip blocks I always say make a few blocks without the foundation and some with and see if the difference then choose. Over the years I have used every type of foundation. Now I use Missouri Star 10" square foundation papers. They are cheap, pre cut with various markings to help if needed, and tear out easily. Also I can stack enough for a lifetime on one small spot on a shelf.