Comment by kragen

Yeah, I think it would be very challenging for most people. It did considerably better with Graphviz than with ASCII art, but it still had trouble with the transition from a perfectly correct and highly nuanced verbal grammatical analysis to Graphviz. I think this is pretty convincing evidence against ChuckMcM's implicit position. It's weaker evidence against mschuster91's explicit position because parsing is something computers have been doing for a long time, so it doesn't imply any new capabilities.

I'm pretty sure there are part-of-speech tagging parsers using fairly shallow statistics that could also have produced an equivalently good sentence diagram. https://corenlp.run/ seems to produce a correct parse, though in a different format.