The ML (metalanguage) family of languages like Standard ML, F# and OCaml intentionally enforce a one-way-flow where a function at the top cannot call anything below it (although there are ways to get around it).

I like this approach to organisation because it helps avoid dependency cyles. https://fsharpforfunandprofit.com/posts/cyclic-dependencies/

I once had to try and understand the entirety of a subsection by hopping between files that mutually depend on each other, which was quite confusing. UML diagrams I drew didn't help my understanding but drawing a dependency tree (the functions called that depends on no more are leaves and functions that call other functions are nodes) before I knew of this technique did help.

This does have its disadvantages though so I think it's a good default in some cases but one should be given the choice to break it when needed.