Visualizing and manipulating should probably be seen as seperate domains though, or at least working on seperate levels of abstraction: effective visualization implies hiding operations; you don’t want to view, or visually edit, your stribg manipulations. But re-ordering your functions called from main() might be more malleable

But even then, how often does such a reordering not constitute detail changes as well?

I think visualizations are much more useful for “reading” code, than for writing it. Which is why visual editors are so appealing: they’re showing off the reading aspect.

Im pretty sure something like the grandparent, or that visual-haskell project whose name I cant remember (where code and visualization are directly equivalent) is the way to go: there’s no paradigm shift to be had here.