I am certainly no expert on the subject, but I would believe tube gear benefits from isolation because tubes can become microphonic (some tubes more than others). Also analog and rotating equipment such as turntables and cd players benefit from isolation. Also speakers benefit from isolation to prevent the vibration from the cabinets from being transmitted to the floor. Beyond that, I would be skeptical of the effectiveness of isolation on pure solid state devices such as solid state amps and preamps. Some say they can hear the difference, but they obviously have better ears than I do.
Do equipment stands have an impact on electronics?
Mechanical grounding or isolation from vibration has been a hot topic as of late. Many know from experience that footers, stands and other vibration technologies impact things that vibrate a lot like speakers, subs or even listening rooms (my recent experience with an "Energy room"). The question is does it have merit when it comes to electronics and if so why? Are there plausible explanations for their effect on electronics or suggested measurement paradigms to document such an effect?