with the Widespread Adoption of Latex?

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With the widespread adoption of LaTeX, Markdown, etc., why do standards bodies continue to write in plain text? Would is not be easier and more aesthetically pleasing to use a PDF, Markdown, etc?

Least Common Denominator You try to open an HTML file in anything other than a web browser, you're going to have a convoluted mess that few non-geeks could make head or tails of. You try to open a PDF using anything other than a program with the explicit ability to read them, you're going to get endless pages of screen puke. You try to open even a Word .docx in anything but Word (or a similar freeware app) and you're going to get a screen full of gobbledygook. You can read a plain-text file with ANYTHING and it will look exactly the same. It looks the same in Word as it does in a browser, NotePad, raw screen dump, or dump it to any printer made in the past half century. View it on a smartphone or a dumb terminal and it looks exactly the same. Which is really the whole point - content trumps presentation.

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Write on PDF: All You Need to Know

You can read a plain-text file in ANYTHING, and they just keep getting more and more insane, but they all retain the same form, the same basic structure, and we're just able to read one or two things at a time, because it's all being written for us in our brains. For instance, an audio file — which is really just a collection of random sounds mixed and matched together. The only difference between an audio file and a text file is that the audio file is read in by a device and then put on a file path in your computer. The only way we can access and manipulate the audio file is if some computer program reads and writes to our hard drive, and that program has a very specific way it does so that doesn't involve any manual input or output, and it all just works.