Using this and XEP-0313 allows for syncing conversations to all clients, whether they were online or offline. I helped implement an XMPP chat feature on a larg

Using this and XEP-0313 allows for syncing conversations to all clients, whether they were online or offline. I helped implement an XMPP chat feature on a large web application last year and I think that implementing these two XEPs are critical to fixing the things users complain about most: Receiving a message in one browser window, opening a new tab or window and not being able to see those old messages, just new ones.