the ability to erase emoji as a reaction on a message
I wish I had the option to delete emoji as a reaction on a message. You can edit the message but you can't edit the reaction to the message.
if I made a mistake or regrat the emoji I added I can't change it. it's annoying sometimes.
How horrible to mistakenly hit the "sarcastic" emoji, when meaning to hit the "sad" emoji - causing fundamentally incorrect emotions.