Even though interfacing seems to be working well during the actual embroidery process, the real results will show up after washing. Embroidery need a heavier stabilizer to keep the stitching supported otherwise they "cave in" after washing. Therefore the advice for an actual stabilizer is recommended. perhaps an interfacing would still be acceptable if a layer or 2 of a llte tear away is floated under the hoop. no need to hoop a floater.