From what I’ve read it can have a positive affect on solid state too. Says that capacitors and other internal parts benefit from racks that help eliminate vibrations. Adding isolators to speaker stands or towers is supposed to have a noticeable affect on sound as well. Again just articles I’ve read but going to put it into practice and see if I can tell any difference.

LFR1100
VP180HP
EP600
M3 In Ceiling x 4
M5OW
M2 - Atmos rears
ADA1500.5
M3 Outdoor Speakers
ADA 1000.8