Earlier quoted context omitted.
> that there's no such thing as "plain text" Please show me a computing device that cannot deal with ASCII. And UTF-8 has, by now, reached a level of ubiquity that encompasses almost everything in IT as well.
The Commodore 64 I’m building could probably be taught how to read ASCII with enough effort, but out of the box it can’t. I appreciate modern computers conform to standards, but that doesn’t mean that these standards have always existed, or will always exist.
Even if such a device needs to be used, decoding ascii is a trivial lookup operation, not remotely comparable to decoding some arcane binary format, or a convoluted XML-derived format such as they are used in WYSIWYG editor formats.
Yes, text relies on an encoding standard. So do numbers btw. (big/little endian, 2s/1s complement, sign/magnitude, floating-point representations), element enumeration (0 vs 1 based indexing) and even boolean logic (eg.: 0 is true in bash, everything else is false)
At the end of the day, computers represent only 2 states: On and Off. Everything beyond that, needs an encoding.
And some of these encodings are, at this point, both so universal and simple, that they can be considered as much a standard of the IT world, as 0 and 1. ASCII is one of those.