When the PDF is a picture collection that looks like text that's when PDF is being used correctly, because that's when something was scanned out of paper and put on a paper-like format for computers, PDF.
When people write text and data and tables on the computer then put it on a paper-like format to share that's when the problem happens.
When people write text and data and tables on the computer then put it on a paper-like format to share that's when the problem happens.