I think we are talking past eachother. I don't play Sudoku without writing, or chess using only my pinky toe, or video games with a glitchy controller, or watch movies backwards, etc. There is a difference between doing X for pleasure/learning, and doing X as difficultly as possible for the sake of being difficult. Maybe my point would be more clear about this project, if instead of using Bash, it was "using only GOTOs and single-letter variables."
Well, I guess I just don't understand your question. They've implement a Forth interpreter in a programming language. I don't see why you equate this with using hammers without handles, or saws made of raisins, or doing sudoku without writing.
Using bash is perhaps unexpected, but it's not like writing machine code in raw, unadorned, inscrutable hex by toggling bits in through a front panel.
It's just a programming language, and it's interesting and instructive to see the end result, unlike watching someone playing chess with their pinky.
I don't see why you think it's so bizarre. It's not doing it in a way that's as difficult as possible .. really, it isn't.
But ... I guess I just won't understand your question.
