> Doesn't it need to? No. That's applying a personal preference - one that I also have - to the rest of the population. Most, and quite possibly almost all, us

> Doesn't it need to? No. That's applying a personal preference - one that I also have - to the rest of the population. Most, and quite possibly almost all, users have chosen features above interoperability. Yes, the situation could change, but no, it doesn't need to. Contrast with, say, mobile phone number portability in the US. While one can still argue for or against requiring it, users obviously actually cared and used it. Even when XMPP was popular, very few users left Google.