Your Dresden Plate block looks like it could be turned and then hand buttonhole stitched to a background. Well done needle turn appliqué holds up well as often seen in antique quilts. I have used Wonderunder for fusible appliqué and satin stitched the raw edges which holds up well. Fusible with a machine buttonhole stitch does get some fraying with repeated washing but no pieces have come loose yet. Many of the art fusible appliqué quilts use a straight stitch with invisible thread to hold the pieces.
Each method has it advantages and disadvantages and I use the method that best suits the intended purpose of the quilt.