@OP "Solid State" devices are full of moving parts - capacitors and transformers in particular. But in any event just because something is solid doesn't mean it doesn't resonate.
Vibration Control
Why do solid state audio electronics with no moving parts need or benefit from vibration control?
It makes perfect sense that turntables, CD transports, R2R tape decks, loudspeakers & tubed electronics (w/ potentially micro phonic tubes) might all benefit from various methods of vibration control or mitigation but I don’t see why anything else would. Any thoughts??