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> Guido, having clearly avoided any relevant literature […] unobservant of prior work

Same thing can be observed for his blog opinions on parsing. Sadly, this gives rise to a whole generation of programmers who believe (on account of perceiving him as an authority) that Peg are actually good.

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Agreed. Unintentional ambiguities are a problem of PEG parsers. Ironically, the old Python parser also failed to detect ambiguities.

There is a strong aversion in the Python space for unambiguous formalisms. A parser that resolves ambiguities by earliest match first seems to satisfy the dynamic mindset.

I've been interested in PEGs recently. Do you happen to know of any literature on what's bad about them?

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