Personally the whole emoji thing is an unmitigated disaster. I'm okay with smileys and gestures but everything else is pointless
At least nothing is wiggling. Of those Unicode points which are graphical, at least all of them can still be printed on paper and won't require a screen. I wonder how long that invariant lasts.
Also, in passwords on websites to keep developers on their toes.
And yeah, :slack-style-emoji-notation: is superior. It was just a historical necessity for Google/Apple.