Hangouts was very tied up in Plus. You can see why XMPP would disappear around the same time: the big move was to getting everyone in that walled garden. The n

Hangouts was very tied up in Plus. You can see why XMPP would disappear around the same time: the big move was to getting everyone in that walled garden. The newer ones I don't know. They all seem very mobile centered. But keep in mind these were developed over a decade, and the situation has been changing rapidly the whole time.