[pixl97]

Yet this is a somewhat backwards way to think if you want society to work. You don't put in 6 hours a day in your own garden to ensure backup food exists, right? Instead we set up systems of regulation and production to ensure we can Instead focus on our own specialization.

[Aachen]

There's more than one store, and more than one payment method. If all else fails, it's easy to borrow/share, and succesful purchases can last a little while. There's redundancies and async operations throughout

If you need to receive a call to a particular number, it having a(n indefinite) disruption can mean you're going to have a bad day. Tech products aren't as mature as e.g. money and food