> these "failed symbols" are right in there

The interrobang and a few other "novel" punctuation marks are there, but many of the examples from the article haven't made it that far, AFAIK. (And probably never will.)

> characters can be from 1-6 bytes, or 2^48 space

It's a minor detail, but Unicode characters are limited to the range U+0000..U+10FFFF, so they fit in 21 bits and require no more than four bytes (in the UTF-8 encoding form) or two 16-bit code units (in UTF-16) in the usual string representations.

(No argument with your original statement regarding what we primarily use, anyhow!)