“Design is everything. Everything!”
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Design is the method of putting form and content together. Design, just as art, has multiple definitions there is no single definition. Design can be art. Design can be aesthetics. Design is so simple, that's why it is so complicated.
Leon Theremin's original designs are elegant, ingenious and effective. As electronics goes, the theremin is very simple. But there are so many subtleties hidden in the details of the design. It's like a great sonnet, or a painting, or a speech, that is perfectly done on more than one level.
My background is in hardware design. I found hardware work to be a welcome change from thousands of hours of programming and that led to the designs you mentioned.
In my opinion, no single design is apt to be optimal for everyone.