Earlier quoted context omitted.
And yet you are here, a site completely devoid of emoji.
Because the social norms of this place currently discourage it. I also don’t use contractions in formal writing settings. Does that make them bad?
But no matter the reason for the complete lack of emoji, the fact that you like this site enough to participate here is evidence that emoji don't actually improve public discussion as much as you think they would.
There are many many sites on which you could have chosen to participate where emoji are common and can be used freely.