I want to emphasize on that. Why do programmers like plaintext, often to the point of wanting ASCII instead of unicode despite its international awesomeness?
That's because we are called when things break down in the machinery. Monospace ASCII may look boring, but it has a precious characteristic: there is (almost) 1-to-1 mapping between the inner representation of a character and its screen representation.
Most programming fonts make sure 1 l | i I all look different.
We make sure we can spot the difference between `'"
We know of the few remaining pitfalls, like space and tabs, \n and \r, the various escape characters, the infamous \0.
Even on that limited representation, there are many things to be careful of. And thing is: this representation is just the start of our work! all the rest hinge on that!
Unicode is full of invisible character, potential diacritics, similar-looking glyps, control character that can break the display in a lot of annoying ways.
We made a whole ASCII-based ecosystem because this mapping is precious in many debugging cases. Whatever one does in the (and I say that non-sarcastically) really wonderful and awesome world of unicode, remember that we are going to often only see it as a bunch of 0xF0 0x9F 0x92 0xA9 (<- ASCII rendition of the "pile of poo"" emoji).
Emoji are great to make some apps prettier, some chat concise, to add non verbal communication to online chat. They are not a tool to help developers' life.