Okay I think I finally get your point, and I even agree. The comparison with an executive assistant doesn't help much here, because the CEO interacts with only one person over all those delegatable activities, and the expectations are that person already knows all the defaults. That's what makes it smooth. This doesn't scale when you must deal with a different AI for each interaction. Will we get to a (scary maybe) point where Siri/Alexa/whoever can actually be that personal assistant? Maybe, but we're still far from it. So at least for today, the conversational interface is an extra burden. And tomorrow, we'll see.
