Yeah, I put it somewhere in the same category as unicycling, or playing a guitar with your teeth.

In fact I'd double down on the "strictly better" bit. There's an instrument that's literally strictly better than the theremin: it makes a very similar sound, looks every bit as cool and weird, but is much easier to play well. The musical saw! https://www.youtube.com/watch?v=q7cMJn0HAdE