How is that any different than when you actually use an IRC client? You leave the chat, you leave the chat. If you're at a social gather or kick back or whatevs

How is that any different than when you actually use an IRC client? You leave the chat, you leave the chat. If you're at a social gather or kick back or whatevs, if you leave the convo, the rest of the people in the group do not enter a freeze state until your return. The conversation keeps going. There's no history or log for you to scroll to catch up. You just re-enter the conversation. How you handle yourself at that point easily shows if you're nice or an asshole. Just like in IRC.