To illustrate why we might need another sewing machine, we don't have just one pot to do all our cooking. We use the one that fits the job at hand. Same with the featherweight. It's great for straight stitching and portability but sometimes we need the advantages of newer machines.
-Decorative/zig zag stitches
-Larger throat space
-Needle up/down
-Ability to move needle right or left