I think the emotes aren't very good for communication since they are very limited and you would need like hundreds of emote options to properly communicate, so people would rather just use them to spam and annoy others, which is why I think a chat should be added. The chat would be very similar to the proximity chat, where you can only hear nearby players (in this case, you would only receive messages from nearby players). You will have the choice of whispering to someone (only they can see the message you sent for them if they're nearby) or just for everybody that is nearby to see (in case you need help, for example). Missing Kids won't be able to chat except with other missing Kids, and Kids that were silent grabbed won't be able to chat either. The Neighbor will also be able to chat in Neighbor form to trick players, and Scary Neighbors will also be able to hear whispered messages from the Kid he disguised into.
There would also be a chat in the lobby, loading and results screen too, which you can hide if you want to.