My thinking has evolved somewhat in this. There's a big difference between a standard and an integrated platform where the client is under control of the server

My thinking has evolved somewhat in this. There's a big difference between a standard and an integrated platform where the client is under control of the server operator, and can guarantee timely updates for changes in the messaging protocols. Jabber is nowhere to be found today, yet we have a plethora of messaging services, perhaps most notably WhatsApp, which seems to have word domination. There are big consumer advantages here, in addition to the known disadvantages.