What is the purpose of those animations? If I could use them in a presentation where I click through a diagram adding things as i click and their connections being animated for highlight then sure. I don’t really like the example where the text changes in you link, the whole diagram jumping around just because a text changes seems like something that would be annoying. So I guess you would need to render everything and keep some things hidden until activated?!
As a side not, I would love a proper Swimlane-diagram. I think you have all the building blocks with your ability to nest things in flowcharts, just need to force-align some boxes in different swimlanes and align the lanes themselves (and probably a lot more behind the scenes).