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Yet every time I hear experienced Forth developers recommending to use more variables, and that newbies tend to eschew them, making the code much harder to read and understand than it is necessary.
You become a true Forth programmer once you go past the code golf and stack juggle phase.
In reality, and with my biases as self-taught person, experience is crucial. Learning on the field. 10,000 hours of practice. Something LLMs are not very good at. You train them a priori, then it's a relatively static product compared to how human brains operate and self-adjust.