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I dunno, if you click [map] on one of the argdown examples, it interactively flips to the diagram of said syntax.

I didn't find that too difficult to discover. It even seemed more interactive.

It is a great picture to show its cabalities, the front-page examples are quite simple.

True, but most people won't click on map.

I did :-)

I entirely missed that button and came all the way back to HN comments to find screenshots..

Agreed. I read the front page and concluded it was a way to write nested lists with colored +'s and -'s.

Yeah, this is a much more convincing sell to me than anything else.