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5 people on earth would dominate humanity with handwritten APL.

A mentor of mine got her start working with a Big Giant Brain as his assistant - he only programmed by reading fanfold paper output and writing his code down. She would type it up, run it, and then bring the output back for him to analyse.

I can imagine such a person finding this idea gratifying, albeit perhaps too much of a REPL for his tastes.

When I started at technical school writing pseudo code in paper before coding into a 512 KB PC with 8" floppies was common, like doing diagrams of data structures, so maybe I am biased.

That would be horrible. My handwriting is terrible.

Hence why it is still a PhD issue, however I think it would be quite cool instead of trying always to fit a keyboard into portable screens.