

I tried to give a genuine answer, but maybe not to the question you really had in mind.
No, I don’t think ease of play and reproducibility should be the goal when designing each and every instrument.
Let’s talk about another, modern synthesizer as an example, SOMA’s Lyra 8. While you can manually tune the instrument to play a scale, it is infamous for modifying any initial tuning due to its internal feedback loops and won’t stay tuned for very long. If you tried to always keep it in tune, you’d be arguably using it wrong. It’s also rather hard to integrate with other instruments since it’s so hard to control - it has a reputation to play it’s user, not the other way around. I’ve heard people say they need a cigarette after a 20 minute session with the device. Yes, it’s hard to play, sometimes maybe even frustrating, but it also is a unique experience and one of my favorite instruments.
Let’s switch to a completely different example. Digital photography, both photo and video, is without a doubt a much more advanced and much more predictable alternative to analog, film-based photography. Still, people are actively looking to shoot film, sometimes even using expired film for its certain look and to explicitly seek the unpredictable.
About 20 years ago, I was asked to repair a Soviet film camera. The shutter timing mechanism was broken, so I replaced it with a completely predictable ATTin85 controlling the old electronics that time the shutter. The artist didn’t like this approach at all and refused to use it.
I hope this gives you a better insight into what I was trying to say.
Finally, as I said earlier, I don’t even believe a good, modern Theremin played by an expert is even be unpredictable to begin with.










I have a sudden urge to watch anime.