This looks really great! I'm not sure I agree with the conclusions, nor the need for a different system than what Blueprints or Geometry Nodes offer. Personally, I think both of those things are great save for the major (and infinitely complex) feature of "clean this board up". The nature of the graphs make it easy to see when code repeats or is doing too much, just so long as the graph, itself, is legible. So if you could have some smart snapping, to force devs to keep it tight, or if you could employ some kind of machine learning for cleaning it up into sensible data flows, I think most of the biggest complaints I've heard from people who actually use these systems, would be addressed.
That aside, I'm always open to a new way! I, again, don't think what was demo'd is any cleaner than Blueprints (especially not fond of all of those connection points. Bottom and top connections don't look tidy), but that is definitely in the eye of the beholder, and this appears to be a well-delivered first attempt, but a first attempt nonetheless, so I'll assume that whatever visual issues I have with it, the underlying scheme works well. Because, honestly, it looks like it does! As presented, I think the system would definitely work great and it would certainly make a few things easier than how they're handled elsewhere. I'll admit, 'curry it to a specific data type and then operate on that' is how I code anyway, so I'm biased toward liking it. But I like that methodology because I think it works exceptionally well, especially for work like rendering. So great work on both the full app and this whole new way of scripting!