by Duff Johnson
A PDF file equipped with quality-controlled tags may be read effectively using a screen-reader or other assistive technology that reads PDF tags. If the
PDF file is also optimized for reflowing of content, it will read well using assistive technologies that do not use PDF tags, as well as on mobile devices.
If accessibility is important (or mandatory), or if you want your files to work well on mobile devices, then you need to learn to tag your PDFs.