The only times that I've wanted more emojis is when I'm creating a markdown file that I just want displayed as the rich html version, and I want some icons there, and emoji are the natural way because they're just unicode. Especially if it's a technical document that makes references to a UI, I feel like I want to use emojis as icons like you use FontAwesome, and i can get ~80% there, but I would benefit from more interface icons there. I've never needed extra emojis for texting though.