Well, that's exactly what I was saying: any visual language for which a text editor is non-viable is unacceptable. And it doesn't so much matter who learns what

Well, that's exactly what I was saying: any visual language for which a text editor is non-viable is unacceptable. And it doesn't so much matter who learns what. What matters is that some time in the future, that data is extractable, and viewable, long after the visual environment has been lost to the world. Maybe it isn't easy, but it's doable.