I'll preface by saying that vvvv looks impressive and certainly seems like one of the more polished options in this space. We have a type of visual programming as part of an internal configuration tool, and I will definitely look into vvvv for how things can be done differently.

That said, this screenshot from one of your tutorial videos highlights the type of thing I think people are worried about: https://i.xkqr.org/screenshot_2020-04-27T09:47:46.png

I'm not saying it's bad – it might just be a question of habit whether or not graph edges are better than named identifiers in text, but it is hard to build away, even with best in class tooling.