It's been proposed!
http://www.unicode.org/L2/L2016/16105r-unicode-image-hash.pd...
It's been proposed!
http://www.unicode.org/L2/L2016/16105r-unicode-image-hash.pd...
Now think about us sitting here in 2018. Computer rendered text has been around for a while (ASCII, UTF, .doc, .html, etc.) In another 200 years, the way we transfer, encode, and view those formats will be completely perfected and probably unrecognizable to us. They will probably be ubiquitous in a way that seems completely alien to us now, and all of the implementation issues we worry about in 2018 will completely fade away (proprietary vs. open, security vulnerabilities, compatibility, accessibility, etc.).
With this in mind, being reluctant to add enrichment to how document transfer works seems like it's obviously on the wrong side of history.