Truth. That tiny shake is death by a thousand cuts, literally. Seen it wreck a simple face mill job where the finish looked like waves because the head had a half loose bolt. Or drilling precise holes that end up .005 over from the bit wandering. It's never one big crash, just your work slowly getting worse.
Ever check your bolts with a torque wrench every few months? Found three that had worked loose on my old bridgeport and it was making this faint buzzing sound you could feel more than hear. My surface finishes went from looking like gravel roads back to glass once I cinched everything down. That slow creep into bad tolerances is sneaky.