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I'm talking about, for example, the way some people still put commas and full stops inside quotation marks they logically don't belong to. Practices adopted by compositors in the lead-type era to stop the smallest lead blocks from making the tallest and thinnest lead blocks go askew, etc. Makes no sense when not setting lead type.
I once came across some teacher's syntax-rules web page where they listed these rules, insisted on their observance and gave that section a title like "Typesetter's quotes". So they knew the provenance but hadn't thought about it.
I was ready to let it slide until he started on punctuation.