The issue is that the term as a technical term, for someone with tremors of whatever kind, is rare outside of, maybe, medical circles, maybe disability circles in the United States. It's like, oh, spindles in fairytales. Lots of people know that Sleeping Beauty pricked her finger on a spindle, a lot fewer people have any conception of what a spindle does and why it might be on a spinning wheel. heck, I'm not sure how much there is general knowledge of what a spinning wheel is for, except (not) turning straw into gold.