Perhaps we're at the point where some bunch of people have already created a Best Current Practice standard for preparing data prior to data sharing? Because it seems like something that someone, somewhere, should have done already.
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People can be great at using their particular tool, and then they'll do something to make you realise that they're just an expert with that tool and that their wider computer knowledge isn't so great.
I've had people want online bank statements as PDFs not CSVs because "anyone can change the Excel file"; I had people asking me to scan engineering drawing on paper to gif files ("Nice and small! We don't have enough space for that other format!" (we did have space)) and then import those gifs into AutoCAD so we could update our versions of the drawings when the customer updated their versions. (The guy before me had given up trying to explain why it was a dumb idea and had just scanned about 1,000 (of about 10,000) documents and saved them as gif.)
Some people aren't particularly sharing data. They're just sharing their information that they've got from that data; the interpretation they're making.