[everythingabili]

I'd say the question was "solved" by Prograph CPX in the 1990s, except the diagram WAS the code.

https://www.google.com/search?q=Prograph+CPX&rlz=1C5CHFA_enG...

You'd have high level classes, and low-level nitty gritty. You could edit your code as it was running (and then continue).

People prefer text (weirdly).