I don't buy this. I've archived a lot of family documents. Putting them on a flat bed scanner and pushing the button works just fine - it is not expensive nor difficult nor inaccurate.
When I was on a trip and had only brief access to a big pile of old letters, I simply took out my phone and took photos of the papers, one by one. It took literally a few seconds a page. I wasn't sure how it would turn out, but later going through the photos, I was very pleased with the results.
I suspect that sometimes archivists get obsessed with perfection, and wind up with nothing as a result. What's really valuable about the HP archive was the text, not the coffee stain on the paper. The archive copy only has to be good enough to read the text, and for that a common handheld phone camera is way more than adequate.