I think those are a bit different. For all of the actions you mentioned, there is only one way to complete the task (eg deleting an app). With Siri, you can also accomplish any of its functionality using the traditional UI. Therefore the user has to remember to use Siri.
However, your point is well taken. Maybe I'm not giving the average user enough credit.
However, your point is well taken. Maybe I'm not giving the average user enough credit.