PDF is reliable
I'm a tech, I work on computer (and POS, Printer, Drive robot, CNC, ...) hardware. I carry my Kindle with me with about a thousand manuals, usually the formatting of a page is important, and if it has flow charts, then I need things in the proper order.
I'm also a Linux Sysadmin, that means that Postscript is a big part of my life, and I have tools at hand to turn that into Acrobat format (pdf).
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