Against this type of terminal guidance, a decoy must have the same shape, size, orientation, and spectral signature of a warhead, and maintain these properties while being ablated. As a matter of engineering, a decoy with these properties will necessarily have mass and volume costs that approach that of a warhead, with none of the benefits of a warhead.

From a weapon design perspective, effective decoys significantly reduce the range of the missiles they are attached to. That is not a tradeoff any weapon designers are willing to make because range is one of the most critical attributes of an effective weapon.