I basically hate emoji, and this is sort of why; when my ascii smilie faces started getting translated into, frankly, horribly ugly emoji that looked nothing like what I wanted to convey, it changed the meaning of what I was 'saying', and in a different way for each platform.

I recognize that this is naive; just because I 'see' an ascii smilie one way doesn't mean others interpret it the same way, but I prefer that illusion to someone else's version being forced on me.

At least in something like Slack, I know the user is getting what I'm choosing.