> The expectation is that we're always connected and respond quickly
As someone who twenty years ago published his XMPP presence to his web page (http://serendipity.ruwenzori.net/index.php/2006/02/27/jabber...) among other oversharing excesses, I have now swung opposite: online presence indicator is the first functionality I disable when I join any sort of forum and my tablet is almost always silent... Asynchronous interrupts least and unbroken concentration is most valuable, so asynchronous mostly - with exceptions for eligible professional contacts and sentimentally close people.