[strboul]

That's a good point IMO and that's why I still find nomnoml my favorite https://nomnoml.com/.

However, nomnoml is more like UML tool than diagramming tool like OneModel. So a big issue could be how to keep all the icons in the text format. With SVGs, the file would be big/or would include some extra assets folder, or with the links directly hosted on OneModel, the file would be tightly coupled.