All one has to do to see evidence of the ability of a well-designed spring system to provide true isolation is to watch on You Tube the videos Max Townshend (a real mechanical engineer, if you care about such matters ;-) has made to promote his Seismic Pod products. He attaches a surface mount accelerometer to the outside wall of the enclosure of a floor-standing loudspeaker, and assaults the speaker enclosure with various forms of vibration, both loudspeaker generated and floor borne, both with and without the Seismic Pods installed.
Having seen the demonstration, the listener may then decide for him/herself whether or not he/she wants to prevent floor borne vibrations from reaching the speaker enclosure, and if he or she wants to evacuate driver-generated vibrations from the enclosure onto which they are mounted.
