Emojis aren't 7-bit clean. They're hard to type. They don't mean things the same way words do. `foo | grep -i error` communicates intent better than `foo | grep :-/` or whatever goofy hieroglyph someone chose instead of, like, a word with clearly defined meaning.
> They're hard to type
I'd like to recommend rofimoji. I have it bound to a hotkey, so whenever I want to type an emoji, I just hit that hotkey and then a window pops up with my most recent emoji already visible at the top. Then I start typing in words that describe the emoji that I want like "crying" and it filters the list. Finally I select one and it pastes it into whatever text box I had selected before I hit the hotkey. My only complaint is I wish it worked for all unicode codepoints instead of just the emoji.
In my experience with live codebases, "error" or "warning" rarely mean the same thing to the same person, but admittedly you're much more likely to guess that they're in use as opposed to crying-green-clown emoji