Apple Reminders has a feature to remind you when you are leaving or arriving at a location. It's super useful! But it's not super low friction to add to a Reminder via UI (it's buried at the bottom of the edit screen), so it's a feature ideally suited for a voice-based reminder. Nevertheless, nobody implemented it.
It's a great feature! I was demoing it to my parents over Thanksgiving and forgot about the lack of Siri support, and of course it failed. Parents were excited when I mentioned it but now won't be using it. Ah well.
