But that's my point, what one irreplacable app/service do people rely on? The only thing that comes to my mind is messaging apps, but even there, almost everyone I need to talk to is reachable on at least one other app. I have multiple taxi apps because I compare prices and availability, like any reasonable consumer should. I have two banks, but even if I didn't, I can pay by cash or card, not just phone. If I need to make a bank transfer, I can go to a branch or do it online. I have two map and navigation apps because they have different strengths and weaknesses. My email is accessible by browser if the app breaks.

I'm not doing this on purpose, I just now scrolled through my app list looking for one app that would actually fuck me up if I lost it in an instant. There are none. And I'm not currently even running graphene or anything else, just a stock Samsung.