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I'm pretty sure text files can reside in the same folder as PNG files.

Yes, but not all documents are trivial to convert to a text file because the layout can be quite complex. A PDF file can have little bits of text floating anywhere and when you search inside the file, you can see it highlighted at its actual position.

I've had to work with PDF files before, and they're absolutely horrible. Precisely because of what you state: "little bits of text floating anywhere". Or something like disjoint, not-grouped, lines for table drawing, instead of a generic table with formatting, width/height, etc.

Though, I generally agree with you, PDF/A is quite a good way of storing documents for long-term. But, that doesn't mean that PNG files along with text files, even with x:y coordinates next to the pieces of text, aren't a feasible alternative.

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