But when Siri was in app form, much (perhaps most) of the benefit that it has now wasn't possible. Not only could app-Siri not do some of the things that peopl

But when Siri was in app form, much (perhaps most) of the benefit that it has now wasn't possible. Not only could app-Siri not do some of the things that people will most often do with iOS-Siri ("wake me up at 7 o'clock", "remind me to call my girlfriend when I get home", "note that I need to buy lettuce"), but you had to unlock your phone and navigate to the app icon before you could even do those things that you could do with it. If you're already using a touch/visual interface to do things, it's cognitively easier to just stick with touches to finish the job. If the interface is entirely spoken/audible, there are a whole other set of things that start to make sense to use voice for.