Great overview of the first lisp, which even invented conditional statements!
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I don't think we're held back by hardware: it's usually insufficient imagination.
Devices like smart lights (Hue) or smart speakers (Alexa) didn't use new hardware, and could have been invented a little earlier.
Decades after sexpressions were invented, Emacsers are still innovating with editor tooling. E.g. lispy is genuinely novel and <3 years old.