[Radim]

As one more datapoint, I do this (=barely ever "compile" / run) even in dynamically typed languages. My primary is Python.

Definitely a leftover from when I was a kid, in the early 90s, without ready access to computers. I remember lying at a hospital bed and filling pages and pages with C64 programs, using pen and paper.

This kinda forced me into the paradigm of "think through invariants and structure first". To this day, typing code out on a computer (incl. compilation) is almost mechanical, not a vital part of the design process.