It seems your fixation is with voice control.
Your various needs/requests can all (or mostly) be completed with a couple of taps. Some of them can (I believe) be done by voice.
I have a problem with voice control, in that I'm not keen to walk around loudly verbalising all my organisational details. apart from the issue of being in a noisy environment, i don't want everyone on the train or wherever hearing my plans for the day, intentions or grocery lists.
Also, an issue with some of what you are saying is the information your phone has (eg. recording insurance co. conversations) could conceivably be sensitive and controlling that info once you have uploaded it to the cloud, or released it by email or tweet or whatever becomes difficult.
I recently switched from ios to windows phone and the "cortana" app seems well able to advise me if I need a raincoat or quickly add a date to my calendar by voice request/command.
But with if your phone were to automatically turn conversations into calendar appointments it would need to have some way to filter out passing reference to a date as opposed to intended appointments.
Your grocery store issues (auto list completion/checking) would certainly require the store to enabled and compatible with your phone/app.
But what happens when your multiple grocery stores change, cheap meat in one this week but in another next week etc. no definite pattern for the phone to pick up on.
Edited by Heathen, : No reason given.