"Soft" footers need to to be highly compliant (squishy) under the load (weight) in question and reactive to the frequencies in question in order to function as expected. Years ago a product called "Panda Feet" attempted to address these issues by offering different sized squishy marshmallow shapes, but even the creator admitted they were of no benefit.
Shape distortion of the footer under compression is how the footer works (by converting the induced vibrations into internal shearing force, producing a minisule amount of heat).
Most accessories are heavy on the pseudo-science but light on the facts backed by laboratory measurements (that apply to the relevant issues). Frankly I'd lump cables, all kinds of supports, fuses, weights, etc. into that camp. Audiophiles aren't trained in all these fields, so we have to rely on word of mouth who frankly we don't know all that well.
