[zozbot123]

> ...and usually lacks good mechanisms for abstraction, reuse and hierarchical structure. It doesn't have tooling for refactoring...

Arguably, the whole point of having a diagrammatic representation with good formal properties is to provide new mechanisms for accomplishing these things. Of course these mechanisms, features etc. won't quite resemble the ones that are in use with text-only languages.

[setr]

Read it as refactoring, or equivalent; the described functions all fall under organizational and editing tools, both of which are necessary in visual and text environments. Lacking decent mechanisms would make a full buy-in difficult for any larger project, regardless of the precise manner in which its done. Without it, you have a write-only language

[wires]

100%

this is the point exactly