Ngl emotes are mostly a meme purpose, never seen the need for them either. ^^ Not in BG3 at least.
In a single player campaign, I do not miss them either, but in a multiplayer campaign, it could be nice to have some basic gestures, mostly for communication.
I haven't tried the multiplayer mode in BG3 yet, but when I play other games with friends, at least one person experiences issues with Discord, so a little fallback system would be nice.