I've often needed something like this, but, sadly, once again, this isn't it.
No discredit to you; this is great work, but for me, personally: The world does not need more diagram editors.
Diagrams are fundamentally not the right tool for the problem I have.
The problem I have is that I have a technical system, for example, a network diagram, or an architecture diagram of a system or set of systems; and I need the data that represents that system, to be visualised in multiple diagrams, in such a way that you can have multiple views of the same data.
This means that when you make a change to the data, all of the diagrams are updated to reflect that change.
As an analogy to explain what I mean, consider a 3D model:
If you have a 3D model, you want to save it as a 3D model.
What you don't want, is to manually draw the way that model looks from 5 different perspectives; because if you alter the model, to say, add a new cube, or change the color of a face; you have to redraw every single diagram.
What would be actually novel, would be to allow you tag / label / whatever the components of your diagrams in some way, and they apply filters to the diagram to generate different views of the data, while maintaining one single master diagram.
I know, this is a hard problem, because layouts are fundamentally hard (if you've ever worked on layout engines you'll know exactly what I mean), and you end up looking like graphviz as soon as you try to use constraint solving to layout the elements in a diagram... I guess.
...but, at least it would be genuinely novel to try.
I don't really see much here that would, eg. get to use it over the many other indistinguishable diagram editors out there.