"...acknowledge the other person/conversation when said conversation is coming to a close. Like a I have nothing left to add here but I want you to know I saw this and I feel like it’s a natural human reaction like nodding or smiling at somebody..."
This is the meat of it, isn't it?
There are two distinct needs, it seems:
1. Acknowledge the good conversation/point,
2. Bring others into the discussion.
These two functions are being conflated into a single device, rather than separate actions.