More cones?

Just read another new review of isolation accessories. It seems like every other review is about isolation and it is getting to be a bit much. I think audio components can vibrate and this can potentialy effect the sound. I also agree different products can reduce or eliminate vibration to various degrees. I use a modestly priced solution myself. (I think I hear a difference). When I start reading different materials of cones are changing the character of the sound it is getting a little ridiculous. eg. "Glass shelves make my system sound hard and rubber makes it sound soft". Also the benefits most often heralded of good isolation is a tightening of the bass. Yet why do so many subwoofer companys mount the amps and crossover right on the cabinet!??!